Definition of big-chested:
(adj) :
Of great size, large.
(adj) :
(informal) Fat.
(adj) :
(sometimes figurative) Large with young; pregnant; swelling; ready to give birth or produce.
(adj) :
(informal) Well-endowed; with a desired body part notably large.
(adj) :
Specifically, big-breasted.
(adj) :
Having a large penis.