a sexual act that may or may not be popular with trans women, according to Miranda Bellweather in Fucking Trans Women #0 muffing is the sexual act of penetrating one or both of the inguinal canals.
I LOVED muffing her last night
by censation December 15, 2010

by BC Ted August 9, 2003

A derogatory word used to describe simultaneous oral sex between two lesbians, often referred to as 69.
by Mr Muff April 12, 2007

by Giggles124 April 8, 2013

by BandyE May 13, 2016

Phooh, she's / he's absolutely muffing !
by Muffindamule October 1, 2006
