Top Definition
An Italian word that translates to "little brother" in english. The word is informal and affectionate, used between either close brothers, or even close friends, and in Italian is taken to mean "little bro."
Hey fratellino, what's up?

Just hanging out with my fratellino.

He's three years younger than me. He's my fratellino.
by Norrington Heights July 11, 2010
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