look up any word, like bae:
 
1.
To hassen someone is to have anal sex with them. Only the male can hassen someone, as it's only considered "hassening" when a penis enters an anus.
Kid 1: Did you hear? Steven and Savannah had anal sex!
Kid 2: Yeah! I heard Savannah got hassened realll good!
by anonymousposterofshit October 12, 2009