When a woman has large breasts due mostly to the fact that she is fat rather than being actually endowed. This is visually determined by the protrusion of stomach below, and barely less far, than said fat tits.
There is a carbon-based bipedal lifeform that resides in Shenandoah Valley Governor's School that has gynecomastia, most likely from severe obesity. He is often seen scoutingthe jungle for parrotts and other frizzy haired art students. In more common terms, gynecomastia is also known as having 'fat tits.'
"Hey, look! It's a Fattittius Maximus and he's flocking with the Parrotius Annoyingashellius!"