muffing

In the sexual sense, popularized by Mira Bellwether's 2010 zine "Fucking Trans Women".[1]

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muffing

1. present participle and gerund of muff

muffing (uncountable)

1. (slang) Penetration of the inguinal canal (e.g. with a finger, or by pushing the testicle back inside it) as a form of sexual activity among trans women and other people with testicles.
   • 2015, Allison Moon, Girl Sex 101, Allison Moon, →ISBN, page 153:

     Muffing is a penetration technique enjoyed by some non-op trans women. It involves fingering (or otherwise penetrating) the inguinal canals, the canals through which the testes drop during puberty. […] Sometimes the testes are pushed back up into the body during muffing, and sometimes they're simply moved aside […]

   • 2018, Eric Yarbrough, Transgender Mental Health, page 177:

     […] she says she and her partner were having a great time last night and she really enjoyed the muffing.