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1.
Lying on one's back while a female sits on your face. Oral sex is then performed on her. The key is to be a black belt in tongue fu. Her secretions then become heavier and heavier until they fill your lungs causing asphyxiation
After a long night of the Dirty Jeff, I am having problems breathing, but my girlfriend is very happy.
by Connielingus April 16, 2007
 
2.
Jeff Smith of Houston, Texas.

Well-known across the country in the underground scenes of art and music.
Did you see Dirty Jeff last night?
by southfourth October 16, 2010