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!"See also: believe, better

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!See also: believe, better

You better believe it!

verbSee You had better believe it!See also: believe, better