to fuck someone in the ears so hard that they lose braincells in the process.
Jason: Sunny, can I braindead you?
Sunny: Sure thing hun!

*30 minutes later*

Jason: You alright Sunny?
Sunny: I can bake I can bake I can bake
by the savageness April 13, 2011
A girl named Morgan.
Ryan: Hey Morgan, wanna go smoke a blunt with me and Cam?
Morgan: Yeah!
Cam: You got the blunt?
Ryan: Yeah man, let's go!
Morgan: Wait, what?
Cam: Morgan's fucking brain dead man.
Morgan: Who?
Cam: You.
Morgan: Oh.

Five minutes later

Morgan: Hey, wait, I'm not brain dead you asshole!
by Rf3mZ February 10, 2008
A girl who either refuses to perform, who who is bad at, oral sex.
"Hey did you hook up with that one girl? I saw you two heading upstairs"
"Yeah, but it was barely worth it, all we did was kiss. She was totally brain dead.
by Joe Gilpin February 01, 2008

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