Ghetto usage:
One who destroys the moment, usually ending an enjoyable event causing negative results.
Also, some drug-related reference:
interupting an act which
may be illegal, sometimes alerting the
police or officials to it ('drug'-bust).
"he's a
real bust, don't invite him next
time!"
"hey, busta, can't you just let us 'roll
one' wid' out spookin us, foh a change!?"