Top Definition
The act of intercourse performed on a bed of grass, a slightly muddy area, or anywhere that "dew" could end up on someone's "johnson."
Q: Did you hear that Chris and Steph did the freak-nasty in the dirt/mud behind the campground?

A: Yea I heard he gave her the Dewy Johnson.
by Steampuncher November 30, 2009

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