A method employed to ball tag another guy. You tell your friend that you were recently bit by a horse. Since this is unbelievable your friend will undoubtedly ask to see it. When he does turn sideways and pull down your shirt coller as if to show a horse bite on your shoulder. When your friend unsuspectingly comes in for a peek you have hime right where you want him. WHAM! Whack him in the nuts with your hand that is appropriately positioned and aimed right at them.
"When Mike was pissing me off i showed him my horse bite."
To grab a fleshy part on another's body, particularly on the underside of the upper arm, squeeze tightly, and then pull your fingers loose without loosening one's grip. Creates a bruise identical in appearance to the one produced by the bite of a horse.
Mr. Jones sent Bill to the office for giving other kids horsebites, noting that such severe bruising could cause blood clots.