look up any word, like cunt:
1. When a backfire results in an epic fail. Like when trying to say "backfire" and saying "backfail" instead.
2. Describes the result of aging to a persons back.
Wow dude, your joke about the Swedish dwarves totally backfailed. Now no one will go to your birthday party.
by khao niaow mumuang August 29, 2011