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End of semester celebrations that occur on the last day of classes and generally involve excessive and early morning drinking, denial about upcoming exams, puking and rallying, and the making of poor life decisions. Spring blowout is generally a larger ordeal, as the weather is conducive to outdoor drinking and slip and slide and seniors like to return to their freshmen dorms to give it a little toast. Like many great legacies, such as full-contact beer pong, this festivity had its beginnings at the College of William and Mary.
"Hey, we've got to find a freshmen to let us in to Yates dorm for spring blowout this year. The administration is hardcore about locking down all the freshmen halls so we can't work havoc."
Blowout by Sabzi April 9, 2008

blowout kid 

pauly d has a blowout kid haircut
blowout kid by pigeonsquad March 16, 2015

Ballroom Blowout 

When you are hitting your boy from behind and you proceed to give him an anal cream pie and the excess dips slowly down his sack.
Hey Spencer did you enjoy that ballroom blowout I gave you last night?

New England Blowout 

When something doesn't sit right on your stomach and you go to the bathroom and take a massive two shits. (Massachusetts)
Friend - Rough night?
You - Yeah, had a New England Blowout.
Friend - What's that?
You - You know....massive two shits..
Hair style of choice for the guido, it usually involves short/shaved sideburns and sides with a large amount of hair on the top, usually spiked so that the wearer looks like they've been electrocuted.
I saw what looked like a porcupine sitting on the headrest of that riced out mustang driving infront of me. Another guido with a blowout.
blowout by The Sub March 10, 2005
1. Melbourne/Australian slang for a GHB overdose. Can vary greatly in severity. Passing out uncontrollably and loss of motor skills are the most identifiable symptoms of a non-serious case. More serious cases involve vomitting and loud indecipherable yelping or yelling. Can result in death.
2. Someone that frequently overdoses on GHB.
1. Carl: Did you see that dude blowout outside.

Paul: Yeh. What an arsehole.
2. Frank: Have you spoken to Sam?

Sean: No, he's a filthy blowout.