When someone is sitting at the bar and another person leans up against the back of the chair/stool.
"Man, its crowded in here.....and I really wish this fat chick would quit roosting on my chair!"
by FSquared711 February 20, 2012
To Roost; to sit and hold loaded marijauna paraphernalia and hold up the rotation instead of hitting it, because you are in excessive conversation, or otherwise distracted.
I have been dying for a hit of that bud, but the dude beside me had been roosting on it.
by Keyster Wong May 30, 2010