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
by torrK August 19, 2008
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.
by soup bone September 21, 2013