Definition of or bust
- The sign on the car said "New Orleans or bust!"
: a sculptured representation of the upper part of the human figure including the head and neck and usually part of the shoulders and breast
: the upper part of the human torso between neck and waist
: to break or smash especially with force
: to bring an end to : break up
: to ruin financially
: a hearty drinking session
: a complete failure : flop
: bankrupt, broke
What made you want to look up or bust? Please tell us where you read or heard it (including the quote, if possible).