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1.
Spanish for "kitten".
Yo tengo dos perros y un gatito tan chulo. ("I have two dogs and a kitten that is so cute.")
by Anonymous February 14, 2004
 
2.
It is the nickname of a girl that is a friend of a guy that he may think is cute but likes to joke around with, usually a small girl hence the name Gatito (Kitten in Spanish). Any reference to a cat the guy has to call it out to her and give her a little elbow nudge and smile.
Movie: "She is one bad kitty" (Guy nudges girl)

"Hey Gatito, is that 12 year old taller than you???" (giggle giggle)
by ununumuss June 28, 2011