undaboobs 

the little flabs of fat and skin commonly found directly below (unda) a man or womans breasts, especially noticeable with increased body fat

"Dude, put your shirt back on. All I see is your hairy undaboobs."

undaboobs by excel_geek May 28, 2005

Hot as Undaboob 

Used to describe the temperature that causes sweat to form and drip down from underneath a woman's breasts. Typically associated with high temperatures and women with large bosoms.

I can't believe the AC broke in the gym on the hottest day of the year - it's hot as undaboob in here!

Hot as Undaboob by Sweaty Smith January 19, 2014

unaboob 

What a large breasted woman gets when she wears an athletic bra.

Helen put on her new size XXL jog bra with no unwires and suddenly realized she had one big smashed boob across her chest, better know as a unaboob.

unaboob by HumboldtBee August 3, 2010