In the dialect of the Italian province I’m from, my favorite insult is “Perdabàll”, which literally means “balls loser” as someone who’s so stupid and useless that could even manage to lose his testicles

Here are a few Austrian ones:

“Häferl” (Cup): someone with anger management issues

“Du rüttelst am Watschenbaum” (You are shaking the slap tree): I’m close to deliver the fruit of said tree to you.

“Ohrwaschlkaktus” (Ear cactus): Someone with large, protruding ears

“Saubauch” (Hog belly): A way of telling someone that they are fat and dumb at the same time. But in a nice way.

Not my native language but the German language has some pretty fantastic words/insults like “punchable face” (backpfeifengesicht) and “brain denier” (gehirnverweigerer).

Argentinian here, I find very funny that a while ago somebody decided to express frustration saying la concha del pato or la concha del mono (lit. “vagina of the male duck” or “monkey”). Yes, the absurdity of a male animal with a female organ seems to reinforce the obscenity somehow.

Heard one: Your mother has a penis and your father is jealous of it.

My personal favourites from Finnish.

“Ei ole kaikki muumit Muumilaaksossa” “Not having all the Moomins in Moomin Valley” Used for people who are either stupid or lack sanity. There are other variants of this and Moomin one is not older than a couple of decades.

I find our version of Grammar Nazi pretty great. We call them comma fuckers.

“Ei voi kauhalla ottaa jos on lusikalla annettu” “You can’t take with a ladle if it was given with a spoon”. This refers also to a lack of something, usually a lack of intelligence or sense.

French Canadian here

All of our swear words are Catholic church vocabulary words. As a never Catholic I always find them hilarious when I say them. They can basically be used as stand-ins for words in the same way as we use “fuck” in English or strung together.

“Saint Ciboire” was my grandmother’s favorite when I would fuck something up.

baptême [ba.tae̯m]: “baptism”
câlice [kɑːlɪs] (calice): “chalice”
ciboire [si.bwɑːʁ]: “ciborium” or “pyx”, receptacles in which the host is stored
criss [kʁɪs] (Christ): “Christ”, or crisser, a more emphatic version of sacrer, both verbs meaning “to curse”
esti [əs.t͡si], [ɛs.t͡si] or ostie [ɔs.t͡si] (hostie): “host [cookie]”
maudit [moːd͡zi] (m) or maudite [moːd͡zit] (f): “damned” (or “damn”)
sacrament [sa.kʁa.mã] (sacrement): “Sacrament”
saint [sẽ]: “Saint”, added before others (ex. saint-simonaque, saint-sacrament, etc.)
simonaque [si.mɔ.nak] (simoniaque): from the sin of simony
tabarnak [ta.baʁ.nak] (tabernacle): “tabernacle”; typically considered the most profane of the sacres
viarge [vjaʁʒ] (vierge): “the Virgin Mary”
Moïse: Moses

Salame

Yes that’s right, it means salami and in spanish it’s used to call someone an idiot. Soft insult, but I use it, and saying so and so is a salami in english would only get me weird looks.

Greetings from Poland.

“bambaryła” - someone who is very silly. Also: someone who is very fat. A little old-fashioned.

كول هوا

“Kawl hawa”

Literally “eat air” in Arabic

Means shut up

“Te falta una patata para el kilo” (in Spanish)

English: “You’re missing one potato for the kilo.”

When you want to call someone a fool or an idiot, you question if they’re in their right mind, if they use their head before speaking or doing something.

My favorite has to be zkundyksicht, it comes from “z kundy ksicht” which literally means “a face [that came] from a cunt”. “Z” = from, “kunda” = cunt, “ksicht” = a rude way to say face.

In Tamil: சோத்துல உப்பு போட்டு தான தின்ற?

Translation: Don’t you add salt to your food?

Context: This is when somebody doesn’t react/listen/change no matter how much they are insulted. The other party asks if they add salt to their food, or if they only eat bland food, and thus have lost all emotions and have become as bland as their food.

It’s a bit difficult to explain, but the general belief is that food reflects your emotions and reactance and moods. Bland food - emotionless, spicy food - easy to anger, etc.

Probably “sluta vara en så lagom rolig person”. It isn’t directly an insult. However, it’s not something you would love to hear. It translates to “stop being a person who has the just right amount of fun”.

Another thing my friends say when they are med is: “Din jävla ångvält!” which translates to “You fucking steamroller!”.
It just sounds much better in Swedish.

Yiddish is not my native language but I think this one is so good it absolutely deserves a mention:

All of your teeth shall fall out except one that gives you a massive toothache.