Testing the tires

This is a term that me and my friends refer to when asking if someone has shit stains in their underwear. These are not the lightly browned streaks, but the heavy streaks that look as if someone was using the underwear to help heat up their racing tires at the track.

1. To have sex.
2. To engage in a sexual act.
3. To go for a ride (on me).

derived originally from: condoms=rubber=tire