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Sexual intercourse between two or more males. Often times hot, sweaty, and hairy.
Darkpriest and Nobodyatall like to have man seckz. A lot.

Will you accept my invitation to a man seckzing?
by Hiryu no Ken July 31, 2003
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Noun: The act of penetrating another man, usually through 'buttsekz'
lmao teh manseckz lolz
by koafish March 31, 2004
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