When body hair (usually on a male, but we will leave that open just in case) escapes the boundaries of the appending shirt collar, shirt sleeves or tee-shirt neck like a spider creeping out of it's hiding place.
Kimberly: Did you notice Fifi's boyfriend Terry had ChestSpiders escaping when we were all at that bar the other night?
Amber: Eeeewwww, yes I did! Imagine having to sleep with him! Yuck.