lateral cleavage 

Lateral cleavage refers to the display of a woman's breasts from the side; a term more polite than sideboob.

While my prom dress did have a little lateral cleavage, it was still okay since I used dressmakers' tape to keep the nipples from being exposed.

lateral cleavage by eViL pOp TaRt February 19, 2013

lateral cleavage 

Lateral cleavage is partial exposure of your breasts from the side. Also known as "sideboob" by the crude at heart.

My top was terribly skimpy; and it caused enough lateral cleavage to be revealed.

lateral cleavage by Cranberry Bob November 16, 2019

Cleavageball 

the game of throwing small objects, such as little balls of paper, inside a girls shirt with the goal of getting it to go in between her boobs.

Bryan: Look at Jessica over there. I'm going to play cleavageball! I'm gonna throw this paper ball inside her shirt.
Barney: You are going to miss! She doesn't have anything!

Cleavageball by poloe December 7, 2012

Sleevage 

The unsightly bulge between your bra and your underarm that totally ruins any attempt to look sleek. Considered the underarm version of muffin tops - and one of top causes of photo fails. Sleevage has been spotted on women of all shapes and sizes, including Hollywood celebs.

Her dress would have been perfect except for the sleevage spilling out.

Sleevage by Ms. Eye Spy January 17, 2014

Screavage 

Screav·age /skrēvij/
noun

when the pouch of skin that holds the testicles is visible, especially when exposed by a low-cut or crotch-less garment.

"Holy shit Bub! That guy was showing 6 inches of screavage!"

Screavage by Trooper Trahan October 8, 2018

groin cleavage 

The gap on each side of a fit man's six pack abs and his pants.

That Brad Pitt sure has some fine groin cleavage in Fight Club.

groin cleavage by Rex Roddy March 23, 2009

cleavageful

full of cleavage, when tits are at there best viewable state, yet still not completly visible

"Wow, that girls boobs sure have gotten more cleavageful."

cleavageful by zoggy April 12, 2008