An expression used for "horny" or "horned up".
"The way she was grinding on me got me real horny, man."
"You must've been horndog, bro."
Someone who is extremely horny in a similar manner to a dog. Dogs are often seen humping random objects/people, a horndog would do something similar. They also are usually of the pedophile appearance.
Person 1: Hunter is such a horndog!
Person 2: I know right? He was humping the biology teacher's leg!
The act of being horny through speech or action.
A: “redacted”
B: “dude you’re horndogging it right now”