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Mata leão, meaning 'lion killer' in Portuguese, is a strangle or choke-hold in Brazilian Jiu Jitsu.

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Can this choke kill someone,i had to use it few hours ago to restrain someone and i didnt even squeeze and guy blacked out(sorry for anime pic idk whats is called)

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Harrisburg Brazilian Jiu Jitsu and Judo, L.L.C. - Mata Leão, meaning 'Lion Killer' in Portuguese, is the name of a popular choke-hold in Brazilian Jiu Jitsu. This same position is named Hadaka