Per the suddenly demure New York Post:

As the Patriots coach walked off the MetLife Stadium field, he threw his arm around his son, Stephen, and added an exclamation mark to the Patriots' 37-16 victory over the Jets.

"Thirty-seven points on the best defense in the league, s—- my d—-," the Patriots coach said in celebration.

[...]

Belichick was asked about the comment this morning on WFAN.

"Any conversations I had privately I'll keep private," he said.