Performing a back rub while simultaneously performing coitus with the recipient of the back rub (and coitus) lying face down.

A compound word of fucking and rubbing.
"Hey baby, you want to do some frubbing tonight?"

"Yea, my back hurts and I'm horny as hell!"
by Gnarly G January 10, 2012
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Condensed term for Fanny Rubbing, the female form of arse kissing. Usually found in internet forums.
Bec: "You always have something intelligent and witty to say Nikki."
Nikki: "Why thanks Bec, you are so kind and lovely."
Ems: "Stop frubbing, bitches, you're making the room smell!"
by NikkiEtonMess June 28, 2011
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The rubbing together of feet. A combination of foot and rub
I can tell you're comfortable when you frub.
by Random_Humanoid December 15, 2022
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Frub: A mix of Nub and Frow, particularly used when someone "pulls a frow and fucks everything up".
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an uncommonly used expression referring to an object or subject of little to no worth; also a bubbly substitute for crap or shit. Origen- the Davemiester, Malden MASS
"The song we sang about Dave is such a piece of frub."
by Rich February 24, 2005
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