muffing

verb

1. (form-of, gerund, participle, present)present participle and gerund of muff

noun

1. (countable, slang, uncountable)The making of a mistake or gaffe.
2. (slang, uncountable)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.

   “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 […]”

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