Top Definition
On Chair Stifling Laughter. The thing you do when you'd rather be rofl, if it wasn't for your manager looking over your shoulder or your parents thinking you're studying.
A: dude...you look like someone stuffed a banana in your ass and mouth at the same time!!!
B: can't help it man...i'm OCSL at (insert fav funny site here)!!! this is the shit!!!
by krist0ph3r September 07, 2009

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