What does America's proverb 'I can't believe it's not butter' mean

What is the meaning of the American adage 'where's the beef'? - Quora

.com: I Can't Believe It's Not Butter Olive Oil Spread, 15 oz : Grocery & Gourmet Food

What does America's proverb 'I can't believe it's not butter' mean? - Quora

What is the native version of this Russian proverb: The same hammer that shatters glass forges steel? - Quora

I Can't Believe It's Not Butter! Vegetable Oil Spread, the Original - Super 1 Foods

Why I Can't Believe It's Not Butter Is Better Than Butter

What is the native version of this Russian proverb: The same hammer that shatters glass forges steel? - Quora

What is meant by the American proverb 'nationwide is on your side'? - Quora

What does it really mean by the saying that 'megadrought' is emerging in the Western US? - Quora

110 Idiom Examples Everyone Should Know

Why can't I believe it's not butter? - Quora

Trying 4 Buttery Spreads — Which One Is Best to Buy at Grocery Store?

What actually is I Can't Believe it's not Butter? - Quora

Can't Believe - Wikipedia

I Cant Believe Its Not Butter Original Yellow Spread, 15 Ounce -- 12 per case.

I Can't Believe It's Not Butter Original Spread , 45 oz Tub (Refrigerated)

When You Can't Believe What You're Seeing - The New York Times

Solicy Cant Believe GIF