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A jabrein is a loud tall jerk who thinks he's the best at basketball and yells at his friends to cheer him on while he fails.
"I shot three free throws and missed all of them, but I still yelled at you to cheer me on. You're welcome."
DM: "You're not my friend anymore. I told my friend group about your secret."
He bragged about his 2-point shot, but he missed it and made a fool of himself.