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A person who sucks at everything. A blowass is basically that one guy who can never catch a break.
"Matt got caught watching porn last week by his parents"

"Damn, what a blowass!"
blowass by Realnigga9499 January 10, 2019
When a woman surprises you during a blowjob and licks your asshole
She was sucking my cock...and then switched around and started giving me a blowass!
blowass by Marianist Athlete March 27, 2008

blowass brothers 

Known as "the Jonas brothers" to teenyboppers and older, even more annoying fangirls alike, the blowass brothers are the next big corporate marketing scam by Disney, which will make a massive profit from them and eventually probably take over the world, at this rate. Like every other recent Disney superstar, everybody is talking about how great they are despite their generic musical style. Hopefully in six months no one will remember who they are, but by then Disney will have moved on.
12 year old: LYKEOMGZZ!!!!!1!111!111 I LOVE THE JONAS BROTHERS <33333 I'M GONNA MARRY NICK HE'S SO HAWTTTT.
intelligent older brother: You mean the blowass brothers, who lack musical talent and sold themselves out to a corporate giant?
older sister: Hey, that's not funny, I love the Jonas brothers.
The act of blowing huge amounts of gas out of ones ass. Excessive flatulating
This guy is Major Blow ass!
blow ass by John Wilson May 26, 2004
To Fart, Pass Gas, etc.
**Sean farts ("Blow Ass") silently; Everyone in the room smells it**

Josh: OMFG! Who the fuck blew ass on my Couch
Blow Ass by CJofATX June 15, 2009
1. when someone is farting they are blowing ass.
2. when something sucks it blows ass.

1. oh shit, cover your noses, i have to blow ass.
2. that fucking blows ass!
blow ass by CurvedMirror July 2, 2008