look up any word, like swoll:
 
1.
Come On You Boys In Green

A common exclamation used in support of the Irish international soccer or rugby teams. Refers to the green jersey worn by the players.
The suspense watching this match is killing me. COYBIG!
by Irish DaveMc June 14, 2012
 
2.
COYBIG= Come On You Boys In Green. The term to support the Republic of Ireland football team, first established at the Euro 2012 tournament.
We can win this game! COYBIG!
by TheIrishBoy June 12, 2012