How Language Evolves

Eight-year-old girl: Why you gotta be yap-yap-yapping all the time on your phone?
15-year-old sister: Shut up! You crazy!
Eight-year-old: Oh, yeah? You a como!
15-year-old sister: What the hell is a 'como'? That's not even a word!
Eight-year-old: Yes it is! 'Co-' like 'cold,' and 'mo-' like 'mole,' on your face!
15-year-old sister: Crazy...
Eight-year-old: You a como. I ain't crazy [gives sister the finger].

--Bx15 bus