/peuh chooh"koh/ ; Sp. /pah chooh"kaw/ , n. , pl. pachucos /-kohz/ ; Sp. /-kaws/ .
(esp. among Mexican-Americans) a teenage youth who belongs to a street gang known for its flamboyant style.
[ 1940-45; El ) Pas ( o ) + -uco pejorative n. suffix, with expressive replacement of s by ch; cf. MexSp pachuco worthless card hand, deriv. of paso pass ]