The regrowth hair that needs shaved in the pubic region, or The few pubic hairs that need trimmed that sneak out of a bikini bottom. The lighter version of a Thighbrow.
Candice was avoiding going swimming with her friends as she had a bad case of crotch spiders, even though she had shaved 3 days ago.
Janice: "Did you see Jerome's spider crotch today?!"
John: "What on earth is a spider crotch"
Janice *makes a fist* "His crotch looked like a dead spider!"