An unnatractive girl who guys use for one night and then fuck and chuck her. Someone not hot enough to score a decent man and someone who's not wanted enough to keep around.
When referred to males, bustdown means the following.
1. A broke male who tries to get money from females.
2. A male with no job, no car, and no future.
Often called scrubs.
2- splitting a cigarette by letting someone finish the last half (or less). usually a favor to someone you dont want to give a whole cigarette to. similar, but not to be confused with an "ace" - the very last drag before putting it out.
1- "hey steve, lemme get a bustdown on that?"
2- "im goin' inside - you wanna bustdown?"
3- "can i have a cigarette?"
"this is my last one, wanna bust it?"