An attractive homeless woman. Usually somthing you would be ashamed to admit.
"is your mum going out tonight?"
"dont know, why"
"she is dressed like a Tooty McBum"
"Aaw, thanks"
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Someone who spends way too much time at McDonald's, and not even to eat anything.
"She's turning into a real McBum because of that sexy waiter."
"My little brother can spend hours at McDonald's just staring at the Happy Meal toys on display. He's such a McBum."