A word used to confuse your friends when they're REALLY high. Stoners usually get a kick out of the crazy reactions they get out of their hippy friends while smokin the dank nugs
Tits: dude... Gundoo *points to the ground*
stoner1: Huh? wtf are u talkin about guy?
Tits: right there man!!! pass me that gundoo!!! Hey tim show himt he Gundoo
Tim: *points to the same spot as tits* see!! Gundoo!!
Stoner1: MAN ur trippin me out!!! WTF is Gundoo!!
Stoner1: Man.. I need more weed