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it's a way of mockingly rejecting something someone said without saying it.
dude B: It's not my fault that I have no money.

Dude A: really? I mean you have no job, didn't finish high school and spend what little money you get from your mom on junk.

Dude B: yeah I know I am not dumb!

Dude A: sure okay dude
via giphy
by Harlequin July 11, 2016
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