verb (used with or without object), flubbed, flub·bing.
- to perform poorly; blunder; bungle: He flubbed the last shot and lost the match.
- a blunder.
- an embarrassing mistake or blunder
verb flubs, flubbing or flubbed
- (intr) to blunder or make an embarrassing mistake
1924, American English, perhaps suggested by fluff, flop, etc. Related: Flubbed; flubbing. As a noun, by 1952.