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.
viết bởi Doubledome 08 Tháng sáu, 2007
immediate fail within 0.01 seconds of trying
law class = instafail
viết bởi mynameisbender 04 Tháng hai, 2010
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
viết bởi rabid9797 04 Tháng hai, 2008
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.
viết bởi pr1nn13s 16 Tháng chín, 2009

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