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1.
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
 
2.
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