To brag about yourself or something you did on your blog.
"Hey, did you read what happened to John the other day when he rescued that guy from the burning car?"

Yea... he was blagging about it"
by I'm the Greatest August 16, 2010
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When one makes an obscure and complete distortion of the facts to his acquatances or disriguard of one others statement by exclamating the word "BLAG" making a mouth with one hand and moving them in a vertical motion. A bender chat only uses two fingers and a thumb.
Person one: See that bird over there? I so totally shagged her.

Person two: Yeah I believe you... BLAG!
by oh that lepperty November 30, 2007
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blag is where someone can be concidered lying, in a big headed way. or in such a way it is hard to beleive what they are telling you...
"i got a 50 inch plasma screen tv at my house"
"blag..."

"britani is gay"
"BLAG!!!!!!!!!"
by Alexg May 30, 2005
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An expression of disgust used primarily to indicate disapproval about the state of something.
"BLAG! This drink is awful."
by Amanda August 25, 2004
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A Black Bag. Typically when you buy something questionable, you will receive it in a black bag...a blag.
Dude - are you going to drink your '40 in the blag?
by a.snod August 4, 2009
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