To be very much on something or all over something; like white on rice; very attracted to something. The term is especially appropriate to use when describing the attraction of a drunk male to a fat chick, or hogging.
Whoa, look at that hot chick with big tits. I'd love to take her home with me. I'd be all over that like a fat kid on cake.
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The amount of something, usually meaning a lot.
I love you like a fat kid likes cake!! <3
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It means they like you as much as a fat ass kid loves to bother his mom about the chocolate cake because he wants it that bad
I love you like a fat kid likes cake
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