Means the word "sleep".

Orginiating from the word "Schalfen" In German but mainly used my teenagers in Scandinavia.

Became more and more used during the late 2010's.
Friend 1: Hey man I think imma go Slafen!
Friend 2: Okay man I think i'll go Slafen too.
by BurgleMan November 8, 2023
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