A shit stain on the underwear usually caused by digging fingers into the ass to scratch out an uncontrolable salty peanut (See salty peanut). Also known as a skid mark.
The bacon strip is the ridge that runs along the underside of a manstesticles and up between the balls themselves to join the base of the penis.
Esteban: "hey Helen can you bring me a band aid, I just nicked my bacon strip while I was trying to shave my boys and the gooch again, theres blood everywhere!"