An old Danish word for being a viking and having been eating mushrooms all fucking day just to rape some women and cattle. Also the name of a pretty awesome Danish band.
"Hey wanna fuck my sister?"
"Relax dude, I'm not going bersærk yet"
"Jeg skal bare have to hajtænder"
"Desværre, vi har kun tamponer, der får dig til at gå bersærk"
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