To punch a man in the testicles from behind causing him to freeze. Traditionally a game played by college students and Navy seamen. Similiar to the Man-Check gender verification is established. The objective is to establish dominance by punching a fellow from behind while yelling "MANTIS" causing him to buckle up or freeze. You recieve bonuses if you mantis your opponent while he has an audience.
"look...Johnson is giving a newcommers briefing, *punch* 'MANTIS' you were served by a mantis ass punch."