A task that calls for a lot of effort but with unpleasing or in rare occasions undesired results, but if said task is not completed, the outcome could be much worse.
example 1
"Mark is at work, but has left his key here. Someone's gonna have to take it to him."
"Sod that dude, I'm stoned. Get him to come back here."
"You have to go. he can't come back here because he has some stew in the slow cooker at homee."
"BLAG!!"
example 2
"having to put 5 tags into the Urban Dictionary is a right blag"
"Mark is at work, but has left his key here. Someone's gonna have to take it to him."
"Sod that dude, I'm stoned. Get him to come back here."
"You have to go. he can't come back here because he has some stew in the slow cooker at homee."
"BLAG!!"
example 2
"having to put 5 tags into the Urban Dictionary is a right blag"
by LeiMagnus June 20, 2007
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...
by Alexg May 30, 2005
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by Bob799 August 7, 2006