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4.
Front zipper or fly of a man's trousers not being fully pulled up.
After he had done a piss, he came out of the can with his fly at half mast.
by Busted Hyman July 05, 2006
 
1.
When you are half way on your way to a boner.
He was turned on half mast.
by artsyfartsygyrl April 18, 2006
 
2.
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
 
3.
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 06, 2006
 
5.
Also knowen as "the Weather Man" someone who is easily aroused in the presence of two or more guys or four second of porno. He smells like a sweaty jock strap because he doesn't know how to shower and never wears socks with running shoes. He is also knowen for breaking anything that can be broken. He is more ADD then a squirrel on red bull and loves to wallow in his own filth which is why you never ask him to clean because he will only make thing worse.
What the fuck Half Mast! how do you get a boner sitting on the couch with two guys?
by Boodro September 01, 2010
 
6.
When a persons pants are half pulled down, usually the result of drinking and falling asleep on the toilet.
Did you see Richard last night?
Yeah he was half mast in the bathroom.
by The real Steve T April 10, 2009
 
7.
When you are at full erection, you look like a flagpole after a tradegy.
So hard it hurts.
by Slightly_Mad March 02, 2004