To act harder than you really are over the internet, or phone.
Buster: Yo holmes, im gunna whip you ass!
Casper: Simon? I'll meet you at West Park on South Central blvd and Alondra.
Buster: Your not worth my time. Or Your not worth it.
Casper: Then quit wasting my time internet banging, leva! I got a bullet for you, next time I see you, punk chabala.