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Similar to 'Thats what she said' but more sophisticated grown up, party slang. Used especially when alcoholic beverages are involved and they are disguised in red party cups.
*Party going on*

Sara: "...so then Ashliegh said to him, THATS TOO BIG!"

All: "woah! thats too big...IN A RED PARTY CUP!"
by Sathalina Garguciliss October 23, 2010