Top Definition
When a mans penis looks like a slimey slug because his dick is limp, short, smelly and wet looking due to being unwashed for a week.

Slug dick can also be defined as an unerect penis that resembles a curved fat slug.
Oh my goodness Becky, he pulled his pants down to reveal his disgusting slug dick!!!
by w a b b i † Willburkey October 26, 2013

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