Definitions by Spency McGee

blow some carbon off the valves 

When one finally has sex after an extended period of abstinence. Sexual intercourse is compared to starting an engine that has been sitting for a while and has accumulated excessive carbon deposits in its inner workings.

Dude, the last time I got laid was during the Cretaceous Period, I've gotta blow some carbon off the valves .

blow some carbon off the valves by Spency McGee September 20, 2017