button-down

conservative, conventional, etc.

a button-down mind

Sit down button

That bit just between the butt and the top of the back of the thigh, where if you kind of tickle it a little bit the person has to reflexively and involuntarily sit down.

(Falls over a bit) "Hey! That was my sit down button!"

Button Down Shirt Energy

Not quite as bad as "small dick energy," but sort of a middle ground. No swag, harmless, forgetable, sexually invisible, insecure men who wear button down shirts as general fashion have this kind of "energy." Sort of a beta male.

Susie: "I'm going on a date with Thad tonight."
Kara: "Why not go on a date with Brad?"
Susie: "Ew. He's got real button down shirt energy."

down button downer

(negative) a person who frequently uses the down arrow button on their keyboard.

Person A: *presses down button 17 times within the span of 3 seconds*
Person B: Eugh, stop being such a down button downer.