The act of achieving orgasm and/or genital secretion via ones thought process with no physical aide whatsoever.
"I had this raging hard on last night and all I could think about was Tyler Perry dressed up as Madea. Unfortunately I was too drunk to masturbate before I fell asleep. Shortly thereafter I was fairly certain I woke up pissing my pants. Once I came to, thankfully, I had realized I was only brainjacking." - Michael Richards
Albert: (sees Mikey making a face) Is he taking a dump?
Mollie: No, he's thinking real hard! - Look Who's Talking (1989)
when your brain is experiencing The Fuzzᵀᴹ and you can’t think properly because everything is happening all at once and people are annoying and noises are sharp and you just want to curl up into a ball in a dark room until the fuzz lifts
“You okay?”
“I wish, I think I’m gonna lie down - I’ve got major brainfuzz today.”
To deliberately use someone else's brain to solve a problem or answer a question, rather than your own, even though, with time and effort, you could solve the problem yourself.
I could've worked out the answer to Fermat's Last Theorem, but I brainjacked Brian instead.
Rather than look at the map on the wall to find her way, she brainjacked me.
At the moment of sexual orgasmA combined feeling of getting the numbing pain of a brainfreeze from a slushy and the momentary paralysis tingling pins and needles feeling from been shot with a tazer
wifey...(gasping for air) what’s wrong, are you ok Hun,
hubby... wow, that sex was a totally mind altering experience; I can’t move for the sensations I’m feeling, I feel like I just got BRAINTAZED......