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1.
Literally used to describe a member of the triads, but can also mean an asian gangster.
"Some goo wak jai jacked my car."
by Manuela January 29, 2005
 
2.
Cantonese for a wiseguy or a smartass, but in modern context it means someone who's a triad member. In English however it's used in a derogatory way for someone that thinks they're tough and cool, when they're really not.
Oh, look it's Mike, the goo wak jai.
by aes January 10, 2004