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1.
An expression used to state how old something is.
My grandma is so dinosaurs.

That house is so dinosaurs.

Friend: Wow, this book is so old it's falling apart!
Me: Yea, it is so dinosaurs.
by MC B-FLOP January 05, 2010
 
2.
Describes an antique like product of any sort, such as someone elderly, elderly people posessions, or just some old shit you found somewhere. I dunno.
Maaaaan dat G-string is so dinosaur Grandma!
by Zigabub March 08, 2014