moodkill 

to disrupt a romantic/sexual setting by doing/saying something gross or unrelated.

Also: moodkilled, moodkiller

My boyfriend really moodkilled today's makeout session by letting rip a big one.

moodkill by alana123123 November 15, 2007

moodkiller

someone or something that changes the mood of the environment ie. kill your high

Chaz:Dude I heard about this banging club downtown, reach my house and we'll take my car.

Brad:Alright I'm on my way.

(reaches Chaz's house)

Chaz:Hey whats up dude. Lets get in my car. I heard this club is crazy. So many bitches bro.

(driving to the club)

Chaz:You know what bro, I dont feel like going anymore.

(turns car around)

Brad:Your a fucking moodkiller bro.

moodkiller by Sheki Shabaz April 20, 2006

Moonkilla 

1. One who dominates Counter Strike.
2. A Sniper
3. ONe who spends a lot of time on video games.

If you see Moonkilla run.

Moonkilla by Moonkilla October 25, 2003