Depending on the partner with flatulence and any prior sexual acts performed prior to the oral sex, the Jimmies may be of the "chocolate" variety, ie, plain shit; or, if there has been a disturbance to the colon and/or rectum, the Jimmies may be of the "rainbow" variety, ie, red, white and various combinations thereof.
Kayla: "Yeah, he really is!! :D"
Girl: "He must be a Jimmy?"
Kayla: "Yup, sure is. Dangg, I'm lucky!!"