an insanely quick shower taken during the intermission of a sporting event, such as between hockey periods
TV Announcer: And coming up on the Dodge intermission report...
Guy #1: Where'd Bob go?
Guy #2: He went to take an intermission shower. If he times it right he'll be back right before the puck drops for the 3rd period.
Not many things in life are as great as a perfectly-timed intermission shower.