The type of turd which is so vast and substantial that relieving yourself of it is comparable to putting down a heavy briefcase you have been carrying all day.
Person 1: 'Hey are you ok? Whilst you were upstairs I heard a colossal thump.'
Person 2: 'Don't worry, I just dropped my internal briefcase.'
Person 2: 'Don't worry, I just dropped my internal briefcase.'
by freshpot September 9, 2011
Get the Internal briefcasemug.