1) one of Jim Henson's muppets. She is a self-centered, dramatic diva. She is also a pig.
2) a person who is a self-centered pig, or a dramatic diva. Someone whose behavior mimics Miss Piggy's.
3) a person who looks like Miss Piggy- in other words, they are extremely fat.
"Matt, once and for all, you don't have diabetes. Stop making shit up just for attention, Miss Piggy."
"Is Slack whining again? Hey, Miss Piggy, stop being such a pathetic drama queen!"