Who, What, or Where is this?

My ancestors came to North America 5,000 years ago.
I am at by biggest and brightest in October.
My weight can fluctuate a lot.
I like to make faces at people.
Sometimes my name is used as a term of endearment.
I don't drink, but I sometimes get smashed.
I have seeds--alot of people eat them as a snack.
Think you know the answer? Scroll down and find out. . .
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. . . I'm a pumpkin.
Originally published October 17, 2005.