A girl who has anal sex in order to "preserve her virginity." A picayune virgin often will claim she is a true virgin regardless of how many times she has been anally penetrated.
"Hey, did you know Josephine calls herself a virgin?"

"Seriously? When we were together we had tons of anal!"

"I know, she's a picayune virgin, man."
by Jackson Walker March 28, 2012
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