An obese female or male that smells and appears to have been down in a dark damp well for some period of time.
p1: "man this club is bumpin!"
p2: "ya bro, just watch out for the wellephant at the bar"
p1: "you see that 5'6", 300 pnd wellephant in the thong!!"
him: "how was spring break bro?"
me: "it sucked, was just herds of wellephants everywhere, big ass booger bears"