1. An ugly girl

2. Lesbian

3. a person who ruins something (i.e- party pooper)

4. a person who ruins an erections by means of anything

5. someone who is so horrific looking that they may prevent futher drinking and partying
EXAMPLES: (( THEY GO ALONG WITH EACH DEFINITIONS BY NUMBER))

1. Dayum that bitch is bonekill

2. She had me going; but turns out shes a bonekill

3. Stop being such a bonekill

4. she sucked my dick soo good; that bitch is a bone kill

5. I woke up next to a bone kill; dayum i never want get trashed again.
by siick_wiit_it_xox December 13, 2006
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A word used to describe anything that turns someone off sexually.
"We were just about to make mad monkey sex until she let loose the nastiest fart I've ever smelled... Instant bonekiller."
by Coreytheman111 January 20, 2012
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When a person causes your boner to go away.
Man, Sarah gave me a bonekill yesterday.
by King Duck III January 20, 2016
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