Jaxson Dart jumped around the Giants ’ locker room, still in his blue jersey, sweating and smiling as he celebrated with teammates.

Bass boomed from a speaker, and the players bounced along. The words to Kodak Black’s “No Flockin” — one of Dart’s favorite songs — filled the room after Sunday’s momentous and shocking 21-18 victory over the Chargers, in Dart’s first NFL start.

Honestly, I’m just trying to be

I just gotta be

Tryin’ to get over on anything

This is the contagious energy the Giants saw from Dart — a first-round rookie — “since the day he got here,” said slot cornerback Dru Phillips. The 22-year-old quarterback was never shy, never hesitant to ask a question.

Everyone noticed.

And on Sunday, he helped deliver a resilient win for a beaten-down franchise that so badly n

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