A potty-mouthed New Jersey school bus aide got the ax after cops said she grabbed a 10-year-old boy and threatened to put his “f—king head” through a window.

The caught-on-video confrontation between the 58-year-old Roselle woman, whose identity has not been released, and the child happened Monday aboard the bus as it was dropping off kids from the Linden Public School No. 2 in Linden, officials said.

Cellphone video taken by another student on the bus shows the aide standing over the boy as the two get into a nasty back-and-forth.

“You must act like that to your parents. I bet they beat your ass every night. I know your father does,” the aide tells the boy, adding that he’s “gonna be sorry,” according to the footage obtained by NJ.com.

Then the woman can be heard telling the child, “Say it again. Call me a b—ch again. How dare you. I’ll put your f—king head through that window if you say it again.”

During the spat, there was a “brief physical altercation,” according to police.

The aide went on to say: “Now you’re pushing it because you’re cursing. I’m not your mother … Now I will beat your ass. You’re a little punk-ass b—ch, that’s why.”

Linden school district spokesman Gary Miller said the aide was not a district employee and was hired by Dapper, a bus company that Linden Public Schools contracts.

Superintendent of Linden Public Schools Danny Robertozzi says the aide was immediately fired following the incident.

“Parents should be able to feel secure in knowing that their children are protected from the time they leave for school until the time they arrive home,” Robertozzi said in a statement, according to NJ.com.

“As a parent and educator, I am appalled at the way our student was treated. This behavior will not be tolerated.”

With Post wires