a person who is a really good friend. or it could also mean if your a weird shady person.
look at that mcchicky in the hall, he is suck a mcchicky for going out with that slut.
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A 'chickie baby', i.e. woman, that you pick up at McDonald's. A play on 'McChicken', the dollar menu item.
Hey man, check out this pic of my new McChickie Baby.
Damn man, you really do like the BBW's, don't you?!