A declaration used in parting from company when one is about to retire for the evening to sleep, but not before masturbating.
In delivery, there should be a slight pause between "sack" and "and" to emphasize that what was implied by the first statement was not what was actually intended.
Me: Well, guys... I oughta be getting along. Time to hit the sack... and then... go to bed.
My Company: (moment of dawning... laughs and jeers)