To fail instantly by your own words when you try to comeback in an argument. (Combined from the words Instant and Fail.)
Bill: Joe, I still think that Cartoon Network has the best Cartoons.
Joe: Say what? Theres Nick, Disney, PBS Kids......
Bill: You watch PBS Kids?! Insta-fail.
A noob part of a group of noobs that try, but fail to own.
Look at this nooblitar and the rest of his friends get pwned.
© 1999-2015 Urban Dictionary ®
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