Northern Irish term used mostly in a sexual context to mean either
a) the act of sexual intercourse
b) a desireable member of the opposite (or sometimes same) sex.
Often associated with letchery and general ungentlemanly conduct and usually heard millions of times in any given Belfast night club that caters to retards and skanks.
"Gis a buck atchee!!"
"Here Mackers, your girl's a buck like."
"Get her Home, Get her Bucked!"