1)Fecal matter that is mostly made up of water.
OMG look. It's a very rare site indeed. A mix breed of an army pile and a water log.
by Mike Rotch October 15, 2004
1 more definition
When a male holds their pee so long they get a boner.
Yesterday Josh got a water log at the concert because he didn't want to miss the next song.
by The hood dweller July 10, 2008