raising the mast

Having an erection while in the pool; generally when swimming backstroke or floating on your back. This gives the image of a ship's mast going up.

You can also say that somebody "has their mast raised".

Bob- "Hey, see that guy raising the mast out in the pool?!"
Joe- "Oh, damn!"

Will- "Hey dude, go raise your mast. There are a bunch of chicks here who would love to see that."
Chuck- " No way man. You'll probably start taking pictures!"

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