A Noun- Funny smooth foreign exchange student who likes american girls and get's more ass then a toliet seat.

Stud Muffin
Girl 1: Did you see the new guy?
Girl 2: Yeah! He's sooo foriegn!
Girl 3: Oh Long Duk Dong!
by KeiraTheFox August 8, 2010
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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.
by Psuedonym McPseudonym Face January 30, 2017
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