muffing noun2 •(slang) The making of a mistake or gaffe. •(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.[…] she says she and her partner were having a great time last night and she really enjoyed the muffing. — 2018 formsmuffings
