(New York Post) He didn’t have a care in the world.

Boston bomber Dzhokhar Tsarnaev spent the two days after the horrific attack tweeting out rap lyrics and partying with his pals.

Tsarnaev, 19, kicked back at an intramural soccer party at the University of Massachusetts-Dartmouth Wednesday, clearly confident that he and his older brother would get away with the marathon massacre.

“He was just relaxed,” a woman told the Boston Globe.

Electronic card swipes on campus show that before partying, the young killer — who was finally nabbed last night — had treated Wednesday like any other day, including putting in a workout at the gym, the Globe said.

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