no 'there' is not slang for 'their'.... their, by the way it's not thier... is the possesive form of they. so you would use it when saying 'i borrowed their map' 'we went to their house and had a party' so it's showing someones possession. where as 'there' is more like describing an area or place like 'over there' or 'take the plane to texas, once you get there...' things like that.
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