Top Definition
Something you say when someone has done terribly at something.
Random Person 1: Do you even remember my birthday?
Random Person 2: Uhmm.... February 9th?
Random Person 1: FAAILL DESU!!!
Other Random Person: You fail desu.
by ducksarecool December 20, 2007
5 Words related to fail desu

Free Daily Email

Type your email address below to get our free Urban Word of the Day every morning!

Emails are sent from We'll never spam you.