Not Mess
A person, generally female, who refers to her/himself as a Hot Mess, but in reality is not a Hot Mess because they are either not currently a mess or, more likely, they are simply not hot. Typically, the subject is under the mistaken impression they are hot.
(overweight) Girl: I'm super-busy, I've lost my keys, my phone is dead, and I've got a million things to do - I'm a hot mess!
You (to friend, whispering): She's not hot...so really she's a Not Mess.
You (to friend, whispering): She's not hot...so really she's a Not Mess.
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