1) An abbreviation for Fat kid
2) what you call a friend (affectionately) or non friend (who doesnt know what it means) when they do something a Fat kid would do (eg: scarf down food, fail to get up stairs, breathe super hard after running a short distance, etc)
Ex 1 :(while looking at an overweight classate you dislike )
Friend 1: He told me I was ugly!!
Friend 2: Ha! are you kidding?! he's a total FK
Ex 2 : (Said to your friend while she scarfs down her burger)
Friend: haha FK moment
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