serve a geeb

to serve someone a geeb means, while using a geeb (gravity bong), to light the marijuana and simultaneously pull the bottle out from the base and to give it to someone else to take. It’s pretty much just referring to lighting someone elses rip, toke, pull, whatever you call the act of sucking the marijuana smoke from the geeb bottle.

Friend 1: “Dude can u serve a geeb for me?You always pull the fattest.”
Friend 2: “For sure dude.”