A heffer on a whole different level. An extremely obesely obese individual breaking the point of no return on the fatness level.
Example 1:
Person 1: Holy fuck, look at that heffer and a half over there!
Person 2: My god, they must weigh 1200 pounds!
Example 2:
Person 1: Have you seen Dave’s new girlfriend??
Person 2: No, she pretty??
Person 1: Uhhh, she’s a heffer and a half but, she’s got a HUGE personality.