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 badcase of crotch spiders, even though she had shaved 3 days ago.
When a semi-"excited" male person's crotch looks like a curled up dead spider.
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!"
12 step recovery jargon referring to someone new who talks about how great life is, now that they'resober. Usually meaning that the person is out of touch with reality.
The new guy seems pretty happy for a dude who has no job, no money and no family. He must be on a pink cloud.