I learned "boner" (= erection) from American friends in the late '60s, and the Online Etymological Dictionary bears this out:
Online Etymology Dictionary
boner "blunder," 1912, baseball slang, probably from bonehead "stupid person" (1908). Meaning "erect penis" is 1950s, from earlier bone-on (1940s), probably a variation (with connection notion of "hardness") of hard-on (1893).
(PS do you remember "on the horn"?)
It is imo possible to have words in 'common' usage that never enter the vocabulary of certain groups in society. There are plenty of gay terms in the dictionary that would never penetrate the US Bible Belt because the whole subject is so outré. Plenty of drug terms too. An entry in the dictionary certainly means that some people use the term, but not all. There are also many words with multiple definitions where one group uses only one of the definitions. 'Fag' as an example, between the US and UK. You can't be me, I'm taken
