Top Definition
The product that comes when person A gets anal really really rough by person B, so hard that person A may have gotten some minor cuts and/or tears of the anus/rectum. Then person B discreetly grabs a bottle of rubbing alcohol and douses person A's anal region, causing pain and anguish while purposefully trying to get the majority inside the rectum.
"dude i heard that chick ended up with some magma mud the other day"

"no way, that's sick"
by kavik_ November 20, 2009
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