Someone who is always on the pull
K: Oi you mans who's on the roost?
mates: ......
K: Oi you mans I said who's on the roost!
Mates: K.I.
K: Yes Blud
mates: You rooster
A really hard piss or a strong morning piss.
Billy drank 19 beers and was so damn drunk that he took a rooster all over the bathroom stall.
cock blocker; one who prevents another from having sexual relations. Also shortened as GR.
Yo man, I was trying to get with Emily but Ben is such a guarding rooster.