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a person or object that is extremely minging or disgusting i.e fantastically rank.
Wow your face is ranktastic
by nowthenchico November 13, 2006
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an adjective for a person/object which isn't just "rank" (disgusting/minging/rancid etc) but fantastically rank!

another way for saying just how disgusting something is.
guy: Hey did you see that naked picture of *name*
guy2: Yeah, it was ranktastic!
by January 14, 2011
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