you (can) bet your (sweet) bippy

you (can) bet your (sweet) bippy

You can be absolutely certain that something will happen. (Sometimes used ironically. You bet your sweet bippy I'm going to that concert—I've been saving up for my ticket for months now! Oh, you can bet your bippy that Kevin will be late tonight—he's never on time! I lost my umbrella, so you can bet your bippy that it's going to rain soon.
See also: bet, bippy