A girl cyph is the act of girls hanging out with other girls to smoke weed. This can be arranged ahead of time or as an impromptu way to bond with new girls you meet.
Girl 1: Ugh I really want to smoke right now
Guy: Oh I’ll smoke with you! ;)
Girl 1: Um no it’s ok
Girl 2: Let’s ditch this guy and go smoke together it’ll be better vibes.
Girl 1: Yes please!!! Girl Cyphhh!