look up any word, like guncle:
 
1.
A sharp or prolonged decline in the birth rate, such as that which occurred in the United States from 1958 through 1968.
After 1957, the U.S. birth rate (per 1,000 population) declined for eleven consecutive years - the longest baby bust on record.
by Anthony Brancato April 19, 2003
 
2.
Droppen your load in a chick's gash, getten her pregnant without a doubt, to 'bust' a baby.
"Ohhh shit dude, I went baby bust in Samantha, no I'm gonna have to stick her with a coathanger and eat that shit."
by Rob July 05, 2004