How Well Do You Know English Slang?
1590s, from Spanish bobo "stupid person, slow bird" (used of various ungainly seabirds), probably from Latin balbus "stammering," from an imitative root (see barbarian).
Booby prize is by 1883: an object of little value given to the loser of a game; booby trap is 1850, originally a schoolboy prank; the more lethal sense developed during World War I.
At the end of every session the dominie had the satirical custom of presenting his tawse as a "booby-prize" to some idle or stupid lout whom he picked out as meriting this distinction so that next time they met he might start fresh and fair with new pair for a new set of classes. [Ascott R. Hope, "Dumps," "Young England" magazine, 1883]
A woman's breast
[late 1600s+; perhaps ultimately fr Latin puppa, literally ''little girl,'' which in child language became ''breast''; whence Old French pope, popel, ''breast,'' German dialect Bubbi, and so on]