You bet your sweet patootie!

you (can) bet your (sweet) patootie

slang You can be absolutely certain that something will happen. Sometimes used ironically. ("Patootie" is a slang term for the buttocks.) You bet your sweet patootie I'm going to that concert—I've been saving up to buy a ticket for months now! Oh, you can bet your patooties that Kevin will be late tonight—he's never on time! I can't find my umbrella, so of course you can bet your patootie that it'll rain soon.
See also: bet, patootie
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

You bet your sweet patoot(ie)!

exclam. You can be absolutely certain! (Patootie is the buttocks.) I’ll be there! You bet your sweet patoot!
See also: bet, sweet
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.
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