The Dirty Jones or Durty Jones as it is sometimes spelled, is defined as the act of pulling out just before ejaculation during intercourse, grabbing the woman firmly by the hair on the top of her head, and upon ejaculation on her face, softly whispering "I'll be at the bar...don't call." (Important to note is that in order for this to work properly, the female typically must experience an orgasm immediately prior to pulling out.) It is known to have been originally used in Florida, USA, in the year 2000. However, there is evidence to support it's use as far west as New Mexico, USA in the latter part of 2007.
Just before he walked out, JJ surprised her with a Dirty Jones.
As he entered the room, JJ could tell by the tone of her voice, both of them were in desperate need of a Dirty Jones.