adj., intensive form of stacked. Descriptive of human physique: Well built, muscled and athletic in the case of males, extremely attractive and shapely in the case of females.
She's got tits like funfair balloons, a waist that can hide behind a flagpole and an ass that could turn the washington monument to sand - she's stacked to the rafters man.
Often used to describe a woman with large bountiful breasts. More commonly used to describe a woman who not only has large appealing breasts, but also has a beautiful face, bodacious hips, and an amazing ass.
Eh yo Chris, see that girl on near the bench press? She is fucking stacked! Damn Kevin, she is stacked.