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"
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!
An expression of disgust used primarily to indicate disapproval about the state of something.
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!!!!!!!!!"
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?