When a person or people enter a room or any place where a GANGBANG is takeing place,the entering person is notDOWN with the situation;thus disrupting the task at hand
Damm Ronnie you're little brother turned out to be a realBUKKAKE BUSTER friday night.
When referred to males, bustdown means the following.
1. A brokemale who tries to get money from females.
2. A male with no job, no car, and no future.
Often called scrubs.
Look at all these fools hangin on the corners, they aint nothin but bustdowns.