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1.
v.

1. To enter an area in a particularly loud over-the-top fashion, usually breaking something on the way in. Sometimes performed utilizing the Sparta Kick. SWAT teams generally perform this with a battering ram.
"the SWAT team had no other option than to fuckbust their way in the house using flashbangs and a battering ram."

Phil: It's a good thing you weren't at the party last night.
Steve: Why's that?
Phil: Because the police decided to fuckbust their way into the house at 2 am just as Jim was about to leave. They kicked the door open so hard they broke his face in three places.
by CrazyMcNinja September 11, 2011
 
2.
adj. being walked in on while in the act of having sex with someone you should not be with, or in a place you should not be.
OMG my mom came home early from bingo the other night. Charles and i were doggie style right in the middle of her bed when she walked into the room. it was a complete FUCK BUST!!!!!
by sweetontweety7777 December 12, 2009