Etymology
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boner (n.)

"blunder," 1912, baseball slang, probably from bonehead. Meaning "erect penis" is 1950s, from earlier bone-on (1940s), probably a variation (with connecting notion of "hardness") of hard-on (1893).

updated on July 27, 2022

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Definitions of boner from WordNet

boner (n.)
an embarrassing mistake;
Synonyms: blunder / blooper / bloomer / bungle / pratfall / foul-up / fuckup / flub / botch / boo-boo
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.