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1.
Slang for tracksuit bottoms/jogging pants.
"Wow, those are some fly trackie bums. You is lookin' HOT"
by informationservices February 22, 2012
 
2.
A British/English term for sweatpants or lounge pants.
Kaelyn: What did you buy at Victoria's secret?
Lucy: A new pair of trackie bums! They're purple and say PINK down the side! Ironic?
by longlivethequeenb September 19, 2013