Sap O' The Morning Wood basically refers to when you try to piss with morning wood. Needless to say, it's splashy, messy, and downright humiliating if someone uses the toilet after you.

Sap O' The Morning Wood is also known as Yellow Fire Hose, Anti-Air, The Bear Grylls Windmill and Gold On The Ceiling.
I woke up with a stiffy and experienced some Sap O' The Morning Wood.
by Obloid July 1, 2014
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When you jerk off in the morning in order to get rid of your morning boner.
I had an important interview that morning, so I rubbed out a sap o' the morning wood, got dressed, and left the house.
by SpringFellows April 28, 2016
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