noun, plural bip·pies. Slang.
  1. an unspecified part of the anatomy (usually used in the phrase You bet your (sweet) bippy).

Origin of bippy

nonce word of uncertain origin Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Word Origin and History for 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.

Online Etymology Dictionary, © 2010 Douglas Harper