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A complete and full erection of the male penis

As opposed to a "Half Mast" or "Semi" when the male is slightly aroused or drunk, and unable to achieve "Full Mast"
"Yasmine baulked as Franks Full mast loomed into view"

"Now at full mast , Greg was emabarsed and could not stand up to get off at his desired bus sop"
Full Mast by Ben L 64 November 7, 2006
Man fuck... I saw Erika’s thicc ass, and I went full mast, shit, could’ve skeet my meat right there and then.
Full Mast by kenjatime May 28, 2020
A mammoth man who walks with an awkward limp. Also, 1/2 mast for a smaller version and tits mast edition for one with man titties.
Damn, did you see full mast. He just walked by that little midget asian kid. He has to be atleast triple his size.
full mast by john john November 30, 2004

flag at full mast 

As he went to hug me good-bye, I could feel the flag at full mast, and I thought, 'maybe I should stay.'
flag at full mast by elvette July 20, 2006

running full mast 

any man running with an uncomfortably noticeable erection, possibly while naked.
Janus ran full mast yesterday morning during his morning job through the nudist colony. He was running full mast, to the shock and envy of all.
running full mast by AnonEmous September 6, 2013