"quickly," Pidgin English, from Chinese k'wa-k'wa (see chopstick).
CHOP. A Chinese word signifying quality; first introduced by mariners in the Chinese trade, but which has now become common in all our seaports. [Bartlett, "Dictionary of Americanisms," 1848]
Quickly; at once •Used as a command or exhortation as well as a
: They cut out chop-chop
[1830s+; fr Pidgin English, ''fast,'' fr Chinese]