Scheisse

Finnish swears are pretty fun but my favorite is perkele

A classic, the French merde.

Kurva/kurwa always sounds fun to say to me

Hodenkobold (Testicle Goblin)

Kacklappen (Shit rag)

Pimmelnase (Cock-for-a-nose)

Klootviool (bullock violin)

Teringlijer ( sufferer of typhoid)

Zakkenwasser (scrotum cleaner)

I'm a fan of pendejo. If you've never heard someone say it you're missing out. It's always said with such utter contempt and the "de" is emphasized so hard it's practically spit out.

Runner up: puta madre

In Italian we have a category of curse words called "bestemmie" which they are actually illegal to say because they're an insult to God or the religion in general.

Some of my favourite ones are "Dio cane" (god is a dog), "Dio merda" (god is a shit), "Dio boia" (god is an executioner).

Behenchod (sister fucker), madarchod (mother fucker), chutiya (roughly translates to stupid/dumb).

Shazbot!

Tabernac!

"chingadera": figuratively, 'thingsmajig' or 'doohickey', literally 'fuckerator'

"mamadas": figuratively, 'bullshit' or 'makework' or 'flattery', literally 'blowjobs'

Chinga - I think it means fuck in Spanish Mexican.

jævlig, jævel, and jævla in norwegian are quite versatile. i am learning it as it's the language of my ancestors and my dad raised me learning it, but sadly, i only learned basic norwegian thru youtube videos he showed me and i'm the only one actively (though on-and-off) learning it. jævlig is like "terrible" but it means "devilish", but you can also say something is "jævlig god" which is like "fucking good".

jævel is a noun, so "en rik jævel" is a "rich fuck". this might be useful for my friend who says stuff like "the horny fuck" or «den kåte jævelen». so it's like "the fuck" (noun) or "fucker".

jævla is like fucking, for example, «ei jævla tispe» is a fucking bitch, or you could say «en jævla tispe», i've heard both. "the fucking bitch" is either «den jævla tispen» or maybe «den jævla tispa», but im still learning.

"Kruzifixdeifelscheissdreck"
It has the benefit of going on for a while so you can either calm down or just keep going...
"Kruzifixdeifelscheissdreckfotzenbeidelfutoaschsau..."
It's limitless, but may lead to a bit of repetitive parts. Usually private ones.

I'm Spanish. I'm partial to "puta madre".

Como la puta madre - like a motherfucker

Está de puta madre - fucking amazing

Hijo de tu puta madre - son of a fucking bitch

Vaffanculo

Malaka.

Perkele! I like the profanity where you invoke the name of a volcano diety

Cazzo is the one that feels the most fun for me after Fuck.

Jamaican - bomboclaat

Merde

Malakas is pretty solid

J'aime aussi tabarnak mais calise est proche. En español, puta mierda es mi favorita. Y también, porque yo soy Tica, nosotros decimos "mae" mucho (but that's not a real curse, it just means dude)

High five to n'importe qui me puede entender 🙌🏼

Sjutton - as I have absolutely no idea why it's a swear. It literally means seventeen.

Do short phrases work?

Because, if so, the Chinese 你妈死了 ( ni ma si la, your mom is dead ) is one of my all time favorites.

It's kinda basic, but I surprisingly don't know almost any other vulgar phrases/words in other languages.

Merde.

Kinderficker has been sadly relevant lately.

Der Scheiß means shit, crap.

Bocachancla

This may be a fleeting fancy, but at time of writing: «Merde»