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.
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!
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.