YGBSMYou Gotta Be Spoofin' Me! (polite form)
YGBSMYou Gotta Be Stuffing Me (polite form)
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References in periodicals archive ?
Jack Donnovan's contribution to the vernacular when introduced to the Wild Weasel concept was more enduring, and became the semi-official motto of the Wild Weasel profession: YGBSM "You gotta be shitting me." This was the natural response of an educated man, a veteran EWO on B-52s and the like, upon learning that he was to fly back seat to a self-absorbed fighter pilot while acting as flypaper for enemy SAMs.
You've got to be shitting me!" As well as this motto -- tactfully abbreviated to YGBSM -- the crews adopted the call sign "Wild Weasel."