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1) School hamburger meat. really nasty.

2) Slimy muddy, pond scum.
1) "Oh shit, was that a hamburger?"
"oh shit i stepped in batmunk!"

2) "hey feel the bottom of the lake over here."
"Eww. it feels like batmunk!"
by Sidenote October 09, 2006
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Copious amounts of seminal fluid in the rectum during an anal gape.
Brad: Natasha and I were batmunking so hard last night.
Carl: I don't care, that's freaking gross.
by ReaCtioNz April 07, 2016
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