You better believe it!
you('d) better believe it
Absolutely, without question; rest assured. A: "Man, he's the fastest runner this school has ever had!" B: "Yep, you'd better believe it!" A: "And is the movie really scary?" B: "You better believe it!"
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
You('d) better believe it!
Inf. a way of emphasizing a previous statement. Bill: Man, you're the best goalie this team has ever had! Tom: You better believe it! Bill: This food is so bad. It will probably stunt my growth. Tom: You'd better believe it!
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
You better believe it!verb
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.