Means to beat your meat or jerk off. They call it killing cats because when you jerk off you kill a cat according to certain myths.
by capt.huggyface August 12, 2008

When you are you are taking a shit and then its coming down like pee. All you her is drip drip (fart) drip drip drip.
by capt.huggyface December 20, 2008
