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A big ass or rear end. Normally used as a compliment rather than an insult.
Person 1: Wow, you have a little bit of a Kim Kardashian going on back there

Person 2: Thanks !
by Nomedog November 14, 2011
When you have been dating for 72 days
Joe: How have you two been dating?
Jim: For a kim kardashian
Joe: lol a what?
Jim: a kim kardashian is 72, like her marriage.
by JoeShome November 06, 2011