From Wiktionary, the free dictionary
See bet a dollar to a doughnut.
dollars to donuts
- (US, informal, figurative) I can tell you (used to assert the speakers confidence in the veracity of the statement).
1962, Chain Store Age[1], volume 38, Chain Store Publishing Corporation, →OCLC, part 2:Dollars to donuts you'll like the price, too . . . only $132.50
1988, Eva Shaw, Your Astrological Guide to Fitness[2], Mills & Sanderson, →ISBN, →LCCN, →OCLC:Dollars to donuts, your spouse or lover will take the cue, and begin the day this way too.