muffing

1. gerundparticiplepresentpresent participle and gerund of muff

plural muffings

1. countableslanguncountableThe making of a mistake or gaffe.
2. slanguncountablePenetration 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.

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

   2018, Eric Yarbrough, Transgender Mental Health, page 177

   1 more example

   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 […]

   2015, Allison Moon, Girl Sex 101, Allison Moon, →ISBN, page 153