Killing Time 

1)The act in spending a particular amount of time with someone(s) and engaging in some physical intimacy.
2) Killing, is fooling around, time is time, thus fooling around during that time.
3) Just like hooking up, but it's killing time.
4) killing time can mean, making out, oral sex, sex, anal sex, orgies, swingers parties, milf adventures, dilf adventures, sexual exploration, homoerotic endeavors, lesbian's curiosities filled, etc.

Byron- Hey man, how was last night?
Devin- It was fun man.
Byron- What did you do?
Devin- I was killing time with Laura.
Byron- Cool.
----------------
Hey Tina, you wanna get together and kill some time?

Killing Time by Devonair March 13, 2009

Killingtime 

The act of drinking, smoking, fucking, imbibing, fighting, smashing or any general chaos in order to pass time between snowboarding, preferably done while in Killington, Vermont. Usually done in a large group of unshaven, unclean individuals with questionable employment history.

the killingtime crew came in here and trashed the place, drank all the beer, smoked out the joint, and impregnated my daughter, man that mountain needs to open soon.

Killingtime by causeadamnrauckas December 20, 2010