To post on an Internet forum under two or more different handles and identities, each with different alleged biographical details and claiming to be real.
Did you notice how much "Morpheus83" sounds like "HotChick161"? I bet someone's mipping.
Term used when a person has their eyesset on a specific person in which they want to mack. A MIP often means that everyone else should back off from progressing to Mack the girl.
Person A: You that girl is my MIP.
Person B: Werd? Alright I'll try to get you in good with her.
Mip is the male version of a nip, where as when a woman, most likely a celebrity, has a nip slip, a guy would have a mip slip. Usually occurs with guys that like to wear open shirts or fishnet shirts.
"Hey, check out the flamer with the fishnet shirt. He just had a mip slip, and he doesn't even know it."