Top definition
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.
by Doubledome June 08, 2007
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2
The action of failing instantly at a tried action.

For instance, the act of not putting sage into the email field, and then posting will amount to an instafail, as the poster has failed instantly at saging.

Other instafail incidences can be seen as linking to ebaumsworld, reffering to a picture of a cat with text on it as a "lolcat", or any other commonplace newfaggotry action that takes place on the internet.

Instafailing is not limited to the internet though, any action that can be perceived as failing at the moment the action is attempting can also be seen as an instafail.
Person 1: hey check out this video from ebaumsworld! its halarious!
Person 2: instafail. don't talk to me
by rabid9797 February 04, 2008
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3
immediate fail within 0.01 seconds of trying
law class = instafail
by mynameisbender February 04, 2010
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The vengeful act of crapping on a lover's chest while they sleep.

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4
A word protaining to Nazi Zombies in CoD WaW, where someone gets instakill, but still (noobishly) manages to get killed by a large number of zombies while the powerup is still active.
CoD: Instakill!

Player: OMG I still died????

spectator: Dude, you just got an Instafail! you suck.
by pr1nn13s September 16, 2009
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