muffing

The English word “muffing” has 2 meanings listed here.

noun

The making of a mistake or gaffe.
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.

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

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Definitions are from Wiktionary, extracted by Kaikki.org, and are available under the CC BY-SA 4.0 licence.