Slister is a name for boys that turn out transsexual within 3 years after they hit puberty. Once the get surgery and complete their transition to being female, they are exceptionally good looking and you would not doubt their gender.

Btw, they they are excellent lovers.
by Jimtheliquor November 21, 2021
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2 or more women that are friends or sisters that have sex with the same dude continuously so the guy refers to them as "slisters" (slut sisters )
Bro1: dude see those chicks over there?
Bro2: ya man
Bro1: they're slisters
Bro2:..wtf?
Bro1: Im fuckin em both.. slut sisters

Bro2: oh nice! *high five*
by imcolinyoumaybe June 7, 2014
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