Top Definition
Usually used in sentence sarcastically, a Compression helmet counteracts and protects against the effects caused by the "fun theory". The "fun theory" states that if an individual has too much fun within a short amount of time, consequently, said individuals head will blow up.
Jon: So, what are doing on this fine Friday night?

Fraser: I have to go to bingo with my 94 year old

Jon: Better bring your Compression helmet!
by Roachey15 August 01, 2009
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