dip for diesel Share definition Flag Dipping your finger into a shitty arse to see how dirty it is or into a menstruating vagina to see how heavy the flow is. I had to give her a dip for diesel to see if she was good to go. dip for diesel by Gingeroot87 August 26, 2017 0 0 Get merch Get the dip for diesel mug. Buy Now — $32.95 See more merch