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Australian horseracing slang for the unexpected defeat of a hot favourite; a surprise result. Later used in contexts outside horseracing for an unexpected result in any context.
Bulgarian Tszvetana Pironkova, the world No.94, caused one of the biggest boilovers on Rod Laver Arena when she came from behind to record a 2-6 6-0 9-7 victory over Venus Williams.
boilover by Quintius January 16, 2006
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A dribbling orgasm instead of an explosion. Also experienced by old people.
After too many orgasms, the guy only had a boilover
boilover by cartman197 September 14, 2006
Related Words
When the fat on a woman (or man) doesn't just go over the edge of the jeans (as in muffintop), but spills down them as well.
You see that muffintop over there? No, Jim, she is most definitely a boilover.
Boilover by IrishPh3n0m May 27, 2012

boil over 

A not so spectacular ejaculation! A male orgasm that lacks significant distance.
A great porn scene building up to a huge ejaculation, and all it was, was a meaningless boil over!
boil over by Captain Wacky August 28, 2007

boylover 

An adult, male or female, with a sexual and/or psychological attraction to young male children.
I thought Jon always hanging out with kids was kind of strange, then he confided in me that is a boylover.
boylover by Chris September 21, 2003

BoyLover 

Boy lover
Boy love

abreviated it is BL

A boylover is a man or woman (usually man) who is sexually attracted to boys. They have their age of attractions anywhere from infant to 14 yrs old.

A boylover is a pedophile child molester wanna be or doing it now to a little boy!

Usually they do not marry or have many adult friends.
They live alone and maybe have a dog to attract boys to them in public so they can perv all over them later.
A boylover lusts after little boys.
BoyLover by you abused me February 1, 2007

Boil Over 

when you don't know what to do and you have a panic attack
"I know there is so much on your mind, I know you wish you could rewind and go back to when the water was cool. cuz now you don't know what to do"
"I'm just trying not to BOIL OVER"
Boil Over by gossipgay April 21, 2013