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1. I can't believe it's not butter
is when you see an ugly person that has some how made themself look attractive through clothes, make-up or other non-plastic surgery enhancement. To test this on someone after a few cocktails (less than three) consider if you would park the love rod in the ham wallet. If yes: "I can't beleive its not butter!" - if no: see fugly.
"Wow, have you seen what Sally is wearing? She's sort of cute now."

Yeah, I know! I can't believe it's not butter!
2. I can't believe it's not butter
Insult used with somebody's name, used if the person has man boobs
"Whoa, you see that guy's man boobs?"

"Yeah, I can't believe it's not butter"
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