Noun - the slang name commonly given to Facebook upon the discovery that over half of the users are now age 35+
Oh my god, I saw that picture of your new orthotic shoes on your Fossilbook profile!
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One who sends pictures of his/her own genitalia to others via social media, most commonly over Twitter.
That tweiner sent pics of his junk that would make a fantastic ad for those little sausages people put out as holiday party treats
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