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A big Thirsty is a really fat chick.. like Hella huge.. rediculously fat and not attractive in anyway shape or form... she jus looks disguting that when seen in public all will point and laugh without regard to feelings at all... usually around 6ft and 300 lbs but sizes vary...
Nell: Goddamn thats a big bitch that just walked bye

Rod: hell yea thats a Big thirsty
by Kiddfresh89 January 04, 2010
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