When performing anal sex and when you pull your dick out there is smears of shit still on it from the other person having shit still in their ass.
guy: WTF?! Why's there shit on my dick.
Women: Ooops I forgot to wipe. Guess you just got a muddy johnson.
Women: Ooops I forgot to wipe. Guess you just got a muddy johnson.
by Kaemine June 16, 2010
Get the Muddy Johnsonmug.