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NBA YoungBoy 's unruly teenage fan from his recent Kansas City concert now has a felony charge to his name before he can even get a driver's license -- for ASSAULT.

Tuesday, the unidentified 14-year-old -- who was filmed wailing the snot out of the 66-year-old usher working inside the T-Mobile Center during YoungBoy's "Make America Slime Again" tour stop in the city -- was charged.

A Kansas City court administrator tells TMZ ... "The teenager is now charged in connection with the attack of a T-Mobile Center employee during an NBA YoungBoy concert last week."

The administrator writes ... "The Juvenile Office of the 16th Judicial Circuit in Jackson County filed one felony assault charge and one misdemeanor assault charge against the teen suspect." Gallery Launch Gallery Ge

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