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Thst act of taking a dump on your SO’s back in a swirl (ice cream like) formation. And then allowing it to slid down their back and leave a snail trail.
Boy: damn, kate is a freak.
Other boy: oh really what did she do on her last tinder date this time?

Boy: she mud snailed the poor guy
Other boy: damn you rite she is a freak....what’s her number again???
by Gabbagabbayoyo March 15, 2018
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