A form of back cleavage which appears in obese people. This is a Portmanteau of the words "back" and "rack". This occurs when a fatwoman wears a swimsuit or bra that is too tight in the back and it squishes the back fat together to give the illusion that there are boobs on their back.
THIS IS THE UNFORTUNATE EXPOSURE OF ONE'S CRACK FROM THEIR UNDERGARMENTS. ALSO KNOWN AS BUTT CLEAVAGE. THIS IS A MORE PLEASANT TERM THAT COMBINES BACK WITH CRACK.
DID YOU SEE THAT GIRL OVER THERE WITH THAT TRAMP STAMP??? HER BRACK ALMOST CUT THAT BUTTERFLY IN HALF!!!!!
PULL YOUR PANTS UP.... YOU NEED TO PICK THE DINGLEBERRIES OUT OF YOUR BRACK!!!!!