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When a man's male member is so large that he could use it to strike a gong.
Man 1: dude, i got an 18-inch dick
Man 2:damn dude, you got a gong dong
by THE_BOULDER February 07, 2017
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A very wide penis (or as what we might call a chode) usually found on a chinese person.
"man that chinese dude must have a gong dong"
by Luke Peterson March 26, 2007
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