is a chiefly North American expression demanding that the opponent in a contest submit.
may be used as an imperative command to demand submission of one's opponent, such as during an informal wrestling match or tickling.
[1] A fanciful suggestion is that it may be based on a joke from 19th-century England about a bullied parrot being coaxed to address his owner's uncle.
[1][3] Another suggested origin is from the English phrase “time out”, a plea to cease hostilities.
[citation needed] There is a common analog in the Arabian Peninsula, the expression "قول عمي" ([q]uwl 'aamiy), which means "say uncle".