Brainplosion 

The chemical reaction within your skull caused by an amazing, revolutionizing, bordering on orgasmic, revelation - often related to a very nerdy subject (but not always, as seen in the example). I.e. a meltdown of the brain. More intense than mindblowing.

Guy 1: Hey dude, I heard Chuck Norris can divide by zero..
Guy 2: OMFG! *brainplosion*
Guy 1: Dude..?
Guy 2: Gaahhh.. *drooling*

Brainplosion by IHeartAndysTractor October 5, 2010

Brainsplosion 

something either so epic or parodoxical in nature that your mind may as well have just erupted within your head.

Eight years ago Mary was half as old as Jane will be when Jane is one

year older than Tim will be at that time when Mary will be five times

as old as Tim will be two years from now. Ten years from now Tim will

be twice as old as Jane was when Mary was nine times as old as Tim.

When Tim was 1 year old, Mary was 3 years older than Tim will be when

Jane is three times as old as Mary was 6 years before the time when

Jane was 1/2 as old as Tim will be when Mary will be 12 years older

than Mary was when Jane was 1/3 as old as Tim will be when Mary will

be 3 times as old as she was when Jane was born.
...
Brainsplosion

Brainsplosion by cmpwksta February 8, 2010

rainplosion 

A sudden outburst of intense rain.

I turned around and looked outside again, and there was a sudden rainplosion.

rainplosion by Bairgh O L'Gharigh June 28, 2019