To tie belts to both front doors of a car. Then while speeding, climbing out through the passenger window, grabbing the belts and laying on the hood at high speeds. As seen in the movie Grindhouse.
Kim: owh hell no! you said were were never, ever, going to play ship's mast again!
by Saint921 April 10, 2007
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When your getting there, but are yet to really put up the tent and let everyone know what you are about
Yogi: Wow I can't believe you still haven't pitched a tent yet
Shamus: Well I've been at Half Mast for about an hour now, so it should be here anytime now

Cordon: Have you been stuffing your pants?
Bleu: Na I've just been sailing at half mast for about a few minutes now

Dave (to himself): Wow who knew that flying half mast in public would be so easy to get away with.
Lady (casually looking at dave): Wow that guy is at half mast, someone should really tell him to chill out
by J Dog12 March 27, 2009
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When the male penis has not yet achieved full erection ie: Full Mast

Usually due to moderate or unsuccessful arousal or drunkeness.

Sometimes called a "Semi"
"At Half Mast Warren walked past the girls, showing his gratitude for their beauty"

"After many beers Douglas was unable to get beyond Half Mast, Gemme was going to get a dud root tonight...if any!"
by Ben L 64 November 7, 2006
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The art of masterbating whilst having a poo at the same time. Preferably one should reach climax at the same time as they push out their poo.
But it is also poo masting if one poo's before they reach climax, or if they reach climax before they poo.
Ben was caught on the toilet poo masting.
He poo masted.
He is a poo masta.
by Poo star February 15, 2008
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When you have half of a boner. Kind of like a chub. You cannot control it. It is just there. Big and thick.
Guy 1: "WTF?!?! do you have a boner?"
Guy 2: "Nah dude, im just half masting"
Guy 1: "ohh"
by My turbin is dirty February 17, 2012
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A school located in Key Biscayne Florida. Houses some of the illest craziest thugs in the entire planet.
"yo son, betta watch yah self or i'ma get mah boy from mast academy to fuck you up and then fuck yo bitch. straight up"
by edd0 August 30, 2003
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