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.
by alana123123 October 28, 2007
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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.
by Sheki Shabaz March 30, 2006
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