Bits of food that drop into your lap/crotch whilst your eating something.
S finishes sandwhich then looks down + exclaims:
"Hey C check it out crotch food!"
"Ah crotch food, its the best type!"
Any type of food eaten by many that is held in the crotch of ones legs while seated. (Most commonly popcorn, chips, candy, etc.)
"Tony, get your hand away from my vitals."
"Dude, it's okay; it's crotch food."