nerf, v. — Green’s Dictionary of Slang

nerf v.

[? SE nerve, i.e. one has to have strong nerves to perform the manoeuvre]

(US, orig. drag-racing) to bump another vehicle slightly with one’s own car.

1970

(con. 1950s) H. Junker ‘The Fifties’ in Eisen Age of Rock 2 (1970) 101: In the city, you could nerf a cab, i.e., bump it gently at a light.