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1.
Rubbing one's crotch against unexpecting people, furniture or walls. A favourite of sex-starved Japanese businessmen on the sub-way.
I caught him frotting the fridge once, it was just wrong.
by bogun_420 June 22, 2003
 
2.
Rubbing/holding/masturbating two penises together for sexual pleasure. Usually, both men stand or lie down facing each other so that the undersides of both penises touch along their entire length, allowing one person to masturbate both penises simultaneously.

The warmth of the other penis and the added stimulation from contact along the entire length of the shaft can create increased sensation compared to ordinary mutual masturbation (hand only). A finger inserted between the heads of the two penises will be lubricated by the combined pre-cum and may cause additional stimulation.

Also may be performed by holding together two penises which face opposite directions (side-by-side or one on top of the other), or by lying down in opposite directions .
"I don't like anal because when you pull out it gives you shitdick. I prefer frotting."

"My bro Jake and I give each other HJs sometimes when we're blue balling, but I tried frotting with him last night and came buckets!"
by WhiskeyAndCigarettes May 27, 2012
 
4.
Sexually rubbing; the uninvited act of stroking one's cock on an unexpected pedestrian, or inanimate object.
Linda: Excuse me sir, what the fuck are you doing?
Creepy Man: You mean you dont like me cock in yer arse?
Linda: Are you FROTTING me?!
by Calum yiken? April 06, 2009
 
5.
The act of collecting faeces, menstrual juices and semen in one's mouth. There are many variations of how this is done but the original is as follows:

The male performs cunnilingus on the female, collecting the faeces and menstrual juice in his mouth. The female then offers him fellatio and through the process of snowballing, passes the semen into his own mouth.

Whether the frott cocktail is swallowed or spat out, is up to the discretion of the participants.
Matt got a good old Frotting from Sarah last night. She is such a good frotter, I wish she gave me a frotting.
by Linen May 13, 2011