The opposite of Smooth brain; a smart person. They have so many wrinkles on their brain, so many wrinkles containing powerful knowledge.
Also a complimentary term used to describe someone after they've done something smart. This term implies an above average intelligence
Person 1: My guy Neil fr talked his way out of getting arrested
Person 2: Bro's a wrinkle-brain.
Person 1: Foreal foreal
The act of kissing and/or making out with a friend you trust, hence the platonic part.
Person 1: Hey you wanna kiss? Maybe make out? Gimme kiss? Kiss me?
Person 2: I don't know why we aren't platonically making out every day