A muck ring is the ring of shit that forms around a penis during anal sex. A Felcher is one who felches. Therefore an MRLF is someone that felches and licks the muck ring off of penises
He's an Muck Ring Licking Felcher (MRLF)
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After you take a shit and wipe your ass you think it's nice and clean only to find out theres still some more in your o ring.
I have to go wipe my muck ring .