1 definition by M.C.Stewart

A extra large crack, as in your butt crack of course. A crack or but, if you may, so large large that it takes up an excess
amount of room.
Joey: She has a huge butt
Max: Naw she has a huge fatcrack

That man who just sat down has such a large fatcrack he took up 3 seats.
by M.C.Stewart March 7, 2008
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