Nickname for a large VERY heavily muscled man, more likely a powerlifter or strongman than a bodybuilder. Usually used when the guy looks the part-- sweat-soaked T-shirt, lifting belt, chalk dust, etc. Calling a woman strength athlete "Gruntus" is usually an insult, so choose wisely.
GymRat: "I'm gonna do some deadlifts, got any chalk?"
Lifter: "Naah, go ask Gruntus over at the powerrack."
GymRat: "No way, man, he looks like he'd snap me like a toothpick!"
Much more comprehensive than just a gunt. A Guntunda is when the gunt is not restricted to simply the front of the body, but instead wraps around the entire back and meets on the other side. Side, front AND back, the whole package of fat. It takes a special sized and shaped woman to display this, along with the proper clothing choices. A delight for gunt lovers everywhere.
Sha'niqua was so farbeyond obese that her gunt turned into a guntunda.