1 definition by chewill

The act of slamming on your car brakes whilst climaxing (during oral sex) causing your partner to slam his/her head into the steering wheel and receive a hearty mouth full of cum.
While getting some road head, Andy decided last minute to give Sara The Inertia so he slammed on the breaks and making one angry jizz fountain.
by chewill May 21, 2011
Get the The Inertia mug.