muffing

/M AH1 F IH0 NG/
verb
  1. 1

    To drop or mishandle (the ball, a catch etc.); to play badly.

  2. 2

    To mishandle; to bungle.

noun
  1. 1

    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.

Source: https://en.wiktionary.org/wiki/muff, https://en.wiktionary.org/wiki/muffing