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1) School hamburger meat. really nasty.

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

2) "hey feel the bottom of the lake over here."
"Eww. it feels like batmunk!"
batmunk by Sidenote October 9, 2006
Related Words
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.
Batmunk by ReaCtioNz April 7, 2016