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1.
(adj.) Much like "rocket science," this term is used to describe any activity which may seem overly intricate to the average Joe Sixpack.
I asked Billy Bob to program the DVR to automatically record WWE every week. He looked at me like I expected him to perform brain surgery.
af fugitive247 10. november 2004
 
2.
anything that is very difficult or complicated
Finding the road to the office is not brain surgery.
af The Return of Light Joker 2. juni 2010
 
3.
A term for a type of oral sex that lasts at least 2 hours and includes extremely cautious and detailed oral contact. In order to perform or receive Brain Surgery, both parties must be well prepped, fed, and cleaned prior to the act.
"Dude, Josh is still in there getting brain surgery!"
"I know. I wonder if he's gonna make it."
af JARS 30. november 2007
 
4.
The act of getting head from a female that is very talented and skillful at her craft.
"Yo son, I chilled with some giraffe lookin' broad last night and got some serious brain surgery"
af Mikey C Notes 16. oktober 2006