noun, plural bip·pies. Slang.
- an unspecified part of the anatomy (usually used in the phrase You bet your (sweet) bippy).
by 1968, “buttocks, ass,” U.S. slang, the kind of thing that once sounded naughty on “Laugh-In” (and briefly popularized by that program). As it often was used with you bet your … it may be nonsense chosen for alliteration, but there may be some whiff of bipedal in it.