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1.
British slang for a sudden, clever idea. Similar to the American "brainstorm." Often used sarcastically.
Suzie invited the neighbors in to see her most recent brainwave, a water fountain in the middle of her living room.
por RayWestlake 02 de Fevereiro de 2008
 
2.
When a genius idea strikes you in the middle of a huge dilemma, saving time, effort, money, you and friends from sobriety or ticketing/over-ticketing/arrest, etc...

Opposite of brain fart, cerebral blockage, bad idea, and so on.
Example #1
Fred: "I can't believe this store stops selling beer at 9 pm. What are we going to do?"
You: "Brain wave! The one down on Jeff Davis Hwy sells until 11! Get in the truck and let's roll!"
Fred: "You are a genius!"

Example #2
Bob: "My car stopped working, how are we going to get to the show?"
You (again!): Brain wave! My neighbor always leaves the keys in his ignition. Let's roll!"
Bob: "You are a genius!"
por Snickers4orphans 18 de Fevereiro de 2009
 
3.
An idea that sparks up once in a while.
It's fun when you get a brainwave,especially if you get to use it.
por SomeoneNew 06 de Agosto de 2011
 
4.
A brain wave is a stupid thought that some kind of idiot gets after a sleepless night. This brain wave can become a brain Tsunami when this idiot is some kind of boss.
A brain farth is also some kind of idea.
Good examples of brain waves can be found in politic environments, for instance: "What about attacking Iran with nuclear bombs ?"
por Filip Bastien 17 de Novembro de 2005
 
5.
When you are receiving oral pleasure (fellatio) and when you are about to blow your wad, you cum in her nose which feels like when you dive in a pool incorrectly and all that water gets into your sinuses and hurts, thus the name brainwave.
Dude, I was getting blown by Jessica and i just felt like giving her a brainwave, she passed out, then I gave her another one.
por Retoric 13 de Junho de 2008