When your partner shits on your penis as a outcome of anal sex or because of your fucked up idea of an kinky fantasy.
by bench knight May 6, 2015
 Get the Shit the Shaftmug.
Get the Shit the Shaftmug. Is another name for a Poop Chute or ones Anus. Often heard being muttered by Sandy or Paddy G in conversations with 'innocent' Birds around from the night before. Also commonly used when reaching in 20+ knots of wind, in fireflies, while in a winning 1,2 position in team racing on Dublin Bay.
by G Spot Ucc February 5, 2009
 Get the Shit Shaftmug.
Get the Shit Shaftmug. by chester mclovin January 27, 2008
 Get the shit shaftmug.
Get the shit shaftmug.