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when a lady's or gentleman's underpant region become increasingly bothered, horny, moist, or brought to the boil a situation comes up which negates or foils the sensation.

A hard on boil that becomes foiled.
1: Watching late night TV for a bit of self loving when a picture of Karen Matthews, Cilla Black or Jade Goody comes on and your 'rock' becomes a 'flop'

2: When a lady is watching late night TV in the hopes that a bit of twisted gaymensex comes on and instead find nothing but Karen Matthews, Cilla Black and Jade Goody lezzing out.

3: Wanking over Britney when you realise you're her Dad.Boil Foiled.
by Sir Bartholomew McTavish April 11, 2008
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