A dirt tickle is when a male is penetrating his female partner from behind in her vagina and inserts his finger into her anus to stimulate his erection.
Dude I was smashingMichellefrom behind and she just wasn't doin' it for me so I put my finger in her ass and gave my knob the old dirt tickle.
When a man does not shower for a few days (3 or 4 will do), to get nice and raunchy, and then, after reaching primo raunch status, has any girl perform felatio. Usually the schmeg can be smelled from head high, so having her face in your dirty, not washed, raunchy croch won't be a pleasant experience for the senses (at least one of them).
I didn't shower for three days, and so when my girl came over I decided to give her the dirty tackle. She went down on me and I smelled it (schmegma) from up top so I know she definitely did too. However, she didn't seem to mind.