Rhonda Round Mouth does not refer to any specific individual. Rather, Rhonda Round Mouth is a slang term which may be used, at will, to reference any female that is known to be a frequent provider of fellatio. The term Rhonda Round Mouth implies that the individual provides so much oral sex that their mouth is literally in a constant state of being open and round because of the constant inhalation of cock.
Bill: Hey dude have you heard about Sonja in the accounting office?
Roger: Yea, you mean Rhonda Round Mouth.
Bill: That's the one!
Roger: Yea, you mean Rhonda Round Mouth.
Bill: That's the one!
by Eaton Holgoode March 3, 2014