Top definition
Literally, to have sex. They word is dirived from several latin roots, and literally means:

"To Strike Below The Middle, With Love"
fen - sub - medi - co - phili

Origionated during a discussion about whether or not "sex on a boat = boat sex".
...
Kelly: "And then, for half an hour, we had-"
Jen: "That's harly appropriate to say around my little sister!"
Kelly: "I was going to say fensubmedicophili, duh."
by POLI January 10, 2007
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