HOFNR

Acronym for "Hard On For No Reason." Used to describe an erection (generally at inappropriate times and places) that has simply been triggered by hormones alone.

Opposite: HOFSR; Acronym for "Hard On For Specific Reason."
"Why do I have this raging HOFNR?"

"Grandma should avoid taking her dentures out in front of you, Bob"
by Ecclesies December 13, 2011
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