Duk is similar in versatility to the f-word. it can be used as a verb, noun, adjective, or adverb. Duk's meaning has become tied solely to its usage, it can be both positive and negative, depending on the situation and usage. most common usage is to declare one's victory.
"look at that duk"(negative)
"you just duked the hell out of that guy"(positive)
"DUK DUK DUK"(victory chant)
A common phenomenon many actors face, mostly child actors, when the public can only see them as their breakout role character, no matter how many other movies they do. Derived from Sixteen Candles character, Long Duk Dong, who was the first to face this phenomenon.
Jimmy: I just saw Gedde Watanabe's new movie, but I only see him as Long Duk Dong!
Jeff: Typical Long Duk Dong syndrome.