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1.
it actually is a german verb for "havin sex", "makin love"...
I as a german prep wouldn't say it, 'cause it's kinda chav word. better say "poppen" or just "sex haben" (havin sex)
Ich will sie bumsen! - I wanna fuck her!
Wir haben gebumst. - We had sex.
by Ma_Li February 28, 2007
 
2.
german word meaning the action to have sex
we had the bumsen all night long!
by Travis March 13, 2005
 
3.
German word for "Fuck"
Oh bumsen! I thought she was home.
by tito3231 January 18, 2006