you bet your bottom

you bet your bottom

You can be sure that something will happen. A less vulgar alternative to "you bet your ass." You bet your bottom I'll be there tomorrow! A: "Hey, Frank, do you want to come with us to the movies?" B: "You bet your bottom I do!"
See also: bet, bottom
References in classic literature ?
I'm homesick from ear-socket to crupper, and from crupper to hock-joint; but it ain't any use, I've got to stay here, till the old man drops the rag and give the word--yes, SIR, right here in this country I've got to linger till the old man says COME!--and you bet your bottom dollar, Johnny, it AIN'T just as easy as it is for a cat to have twins!"
Would you bet your bottom dollar everyone will come out smelling of roses?