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.
A: Yea I heard he gave her the Dewy Johnson.
by Steampuncher December 1, 2009