Definition: Someone who is blissfully unaware of how ugly he or she really is. This is often used as a trash-talking codeword.
Lydia (to her group of friends): OH MY GOD, did you guys see Sindy Snartmann's short skankhoe skirt?!?
Idiot friend #1: Uh chyeah, she's so not cool.
Idiot friend #2: I think Sindy's pretty rad & all..she did offer three guys blowjobs, even though they said no.
( idiot friend #2 gets slapped)
Lydia: Whatever, Idiot number two. I still think she's a boatload of shenanigans.