A Manhattan judge Friday blasted ex-con rapper Tekashi 6ix9ine for squandering his chance at freedom by violating probation again — and slapped him with another three months behind bars.

The 29-year-old flamboyant musician — who appeared in court with streaks of Christmas red-and-green in his hair and wearing a red fleece and white Crocs — learned his fate after most recently breaching the rules by punching a man who taunted him for snitching on his former gang.

“He keeps blowing it,” federal Judge Paul Engelmayer seethed during the proceeding in Manhattan federal court.

“You believe the rules don’t apply to you,” Engelmayer told the Brooklyn-born rapper, whose real name is Daniel Hernandez.

The convict admitted he violated the terms of his supervised release with the Aug. 8 assault

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