in German
Fick Dich = fuck you (if you want to be grammatical about it)
Mutterficker = motherfucker
Scheisse = shit
Scheisskopf = shithead
Schwanzkopf = dickhead
mach es dir selber = go fuck yourself
Blödes Arschloch = stupid asshole
...and one of my favorites...
Blöde Fotze = Stupid cunt
If you're going on vacation out of country, pay a visit to this site.
How to swear in foreign languages