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1.
when a guy gives a girl so much pleasure that she faints. it is one of the hardest sexual feats to do.
I gave my girl the knockout cause i was just that good at the sex.
by Dj the dl September 23, 2009
 
2.
n.
a. A musical quartet of the Power Pop/Mod/Punk Pop genre that can successfully deliver roundhouses to the face of Chuck Norris
b. A group of well dressed ninja warrior musical geniuses

Adj.
a synonym for "Fuckin' sweet, homie!"
Wow, I thought Chuck Norris was immune to roundhouses to the face! Now that I've seen The Knockouts in action, I know otherwise...

Damn Mildred, your tits is The Knockouts!
by Badass Punk April 18, 2006
 
3.
Chugging an entire beer while the bottle fills with smoke, then inhaling the smoke.
Guy: "Got some beers, wanna use the knockout?"
Dude:"Fuck yeah, hook me up!"
by Outer Exos May 05, 2013