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
2 more definitions
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
When a person shits and vomits at the same time. Usually when they are very sick.
Timmy got so sick from that old fish he started roosting in the night
by jimmmyp June 07, 2010