The exact point when a combination of things (Hangover, Tiredness, Girlfriends/Boyfriends, Heat, Noises) culminate to produce the biggest stress head you have ever had.
Normally signalled by a large release of breath follwed by the exclamation "Booooiiillllleeeedd" in a high pitched tone.
A boiled head can be cured by beer, sleep or a "reflection hour" where the topics that have boiled your head are discussed with friends
See also cooked
Dude 1: Maan, Mike had a crazy night last night, he was in the club and about 5 of his ex girlfriends were there. He got home at 5am and had work at 8am! I hear his ex has been on to him all day too
Dude 2: Isn't he working duty til 10pm?
Dude 1: Oh man he must be BOILED!
*Mike walks in*