Derived from the Spanish, it means a banging body. (Urban Dictionary)
"By winter's end, you've gotten to know all the morning regulars and there's even this one girl who inspires in you some hope. You pass each other a couple of times a week, and she's a pleasure to watch, a gazelle, really - what economy, what gait, and what an amazing fucking cuerpazo."
- Junot Díaz, "The Cheater's Guide to Love", New Yorker 23 July 2012