Button Top 

Like a muffin top, only lower, and specifically in the rear. Caused by insanely too-tight shorts or pants that squeeze one's butt cheeks out like it's butt cleavage.
plumbers crack muffin top

It wasn't just a plumber's crack, there was serious button top on display.

Button Top by Crabby McClaw June 19, 2014

Button Top Mushroom 

A penis that resembles small mushroom with a big round head.

I tried to enjoy it but he had a Button Top Mushroom for a dick

Button Top Mushroom by poop in the clit April 28, 2017

Top Button Swag 

When someone has all of their buttons done up on a polo shirt and it looks nice/good.

Person 1 - "Whoah, Lydia has all her buttons done up on her polo shirt, it looks really nice."
Person 2 - "She has top button swag obviously."

Top Button Swag by chexxa November 26, 2011

top button butch 

A girl that is very manly. They are the butchest of the butch. Their masculinity is something of wonder and never in question.

"Do you see Sarah over there with her wide stance and domineering presence?"

"Oh yes she is a total top button butch."

top button butch by Iknowsomeofthesethings June 10, 2018

Top button

When you button the top button of your shirt

Nick is sure rockin that top button

Top button by azgoose November 13, 2009

[Top button] 

When you button the Top button of your shirt

He must be cool cause hes blingin that Top button

[Top button] by easy101 January 13, 2010

just top button 

Common slang for "just the top button"

"Hey, can you look up on urbanditionary what "just top button" is"

okay. <go to computer and enter "just the top button">

"The definition isn't here man. I guess i'll just enter in the definition"

<Enters the above into the definition>

just top button by niggletss February 6, 2014