This starts off with a guy taking a shit on the upper part of a girls back. The guy then slides in between the girls legs on his back and begins to masturbate. The chick straightens her back and the shit slides down her back and onto the masturbating mans cock. After all the shit has slid off her back she then squats over the man and pisses on the poopy dick leading to a gigantic orgasm for the man.(Assuming you like masturbating with piss and shit)
God Dammit, that fucking hooker I bought for Don's bachelor last night charged me an extra 100 bucks to give him a Rock River.

This term comes from The Rock River which runs through my hometown of Rockford, IL. It is dirty and consists mostly of the piss and shit from the Nascar hillbillies that live here and boat on it.
by SaggyBallsHD February 8, 2006
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A river rock is a solid hard turd, followed by raging diarrhea!!!
Dang Brett don't use the bathroom, Steve had a river rock that he just let loose not a good sight!!!
by stevetotheo April 14, 2015
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Illegal Mexican immigrants that drown trying to cross the Rio Grande river into the US
Cletus: I'm sick of those fucking river rocks coming and taking our jobs
Clint: Damn straight. Now pass me the chewing tobacco
by My_Real_Name_420 July 14, 2017
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The looseness of bowls in which diarrhea is exerted from ones anus at high velocity, at such a rate it is perceived as rock being thrown into a river.
Hey Ralph, earlier I had that worst case of rocks in the river… taco bell just does not agree with me any more.
by Gnars December 30, 2005
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the shitist drink in the world that tastes like shit and gives ppl diarria do not drinkm river rock it will give u rebola
river rock tastes like shit
by bellygwen NoodlZ July 28, 2015
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