Top definition
Tanning naked with an erection to avoid embarrassing penis wrinkle tan lines.
Dude 1: Yo, why are you laying by the pool naked?
Dude 2: I'm tanning my penis.
Dude 1: Don't you know you can only get a nice even wang tan
when you have a boner? Rub that into a sundial.
Dude 2: Shit. good call.
Dude 1: What time is it?

by YoungBuc September 18, 2007
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2
The art of taking a massive dump that stands straight up out of the water much like a sundial standing straight out of the sand
O dude i took a huge as shit yesterday and you won't believe it.....IT WAS A SUNDIAL!
by Nastiestpoopweinerurinaldeuce January 26, 2009
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