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1.
1) A fit of unrestrained orgiastic anger. One step up from apoplectic rage.

2) The climax of make-up sex where the 'make-up' issues haven't been completely resolved and one or more of the involved parties are still angry.

The word is a portmanteau of 'rage' and 'orgasm'.
My girlfriend threw me out, I stubbed my toe and then dropped my wallet down the grid. I had a complete ragegasm in the middle of the street.
by TheNexus May 19, 2011
 
2.
This is when you party aka 'rage' so hard that it goes on for days. a ragegasm should last a good long weekend on none stop raging on rageahol to the point people think that your a rageaholic.
bob: hey are we gona rage face this weekend, at neil's place and the Umphrey's show?
Joe: Fuck yeah! this is gona be a ragegasm

jim: hows the party
john: its a ragegasm!!!!
by Mmacsai July 30, 2011
 
3.
To achieve an orgasm while listening to Rage Against The Machine.(Usually results in wanting to punch someone in the face.)
Guy 1:Oh dude when I heard bulls on parade I totally had a ragegasm.
Guy 2: Dude that's gross.
by Grant W. October 22, 2006