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1.
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!
af Captain Wacky 23. august 2007
 
2.
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.
af Quintius 15. januar 2006
 
3.
A dribbling orgasm instead of an explosion. Also experienced by old people.
After too many orgasms, the guy only had a boilover
af cartman197 14. september 2006
 
4.
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"
af gossipgay 21. april 2013
 
5.
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.
af IrishPh3n0m 29. februar 2012