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1. When you have to take a shit really bad and it comes out as a runny burst.

2. Having sex with someone in the anus and having a lot of fun in the process.
1. That asshole Matt left an assblast all over my toilet!

2. We had a real assblast at the party last night. Matt's ass is going to be sore for a week!
by Frank Enbeens May 12, 2007
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When something awful happens that infuriates you, You have an 'Ass Blast' The event is so upsetting that you feel as if you could have a blast out of your ass.
Dude, An elf just took my cookie! I'm going to have a gnarly Ass Blast!
by Ricky and Carlos July 07, 2011
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A 3rd-coast based project putting free bicycles back on the road with a rat-rod mentality and no thought given to comfort. Assblast was originally just the name of the initial bicycle (now named "ANAL FIESTA I"), and was given to the bicycle due to the fact that with no rear tire that shit really hurts one's ass who so choses to blast that bitch down the road.
Assblast projects include =

DUALLY SCOOTER (done but broken)
AF I (incomplete)
SCREAMIN SEMEN (waiting for a tire)
AF IV (super dangerous)
by ANALFIESTA June 18, 2014
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