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1. slang Of a woman, having very large breasts. I know as a woman that you're supposed to want big boobs, but I actually wish I weren't so top-heavy. It's become something of a humorous trend that all of Jack's girlfriends tend to be, shall we say, a bit top-heavy.
2. slang Of a man, having large upper-body muscles with relatively small lower-body muscles. You need to be sure you're not skipping leg day at the gym, or you're going to wind up looking pretty top-heavy. The beach is always swarming with top-heavy gym rats strutting around on skinny little chicken legs.
mod. heavy-breasted; buxom. Britney gets a little top heavy when she is gaining weight.