To treat someone that's younger than you like they don't know what they're doing just because they're younger.
Olderguy: Hey, nigga, you look like you ain't know shit

Youngerguy: Ayy nigga, don't try to Lil bro me just cuz you older

Olderguy: My bad nigga, we cool?

Youngerguy: Yea, we cool.
by Your Server ADMINISTRATOR July 22, 2018
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A lil bro is one who is always there for you and has your back at all times. One who you can mess around with whenever. Even though they can be a pest whenever they wanna be. They are still the ones who can pick you up when youโ€™re down, the oneswho makes you laugh when youโ€™re sad, the ones who understand you when nobody else will, the one who looks up to you and wanna be like you when they get your age. A lil bro is your all time best friend and you wouldnโ€™t be the same without them.
My lil bro is so annoying! When I got home from school, he ate the last piece of pizza. So I slammed him.
by Guest052301 November 05, 2018
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Person in the group who gets drunk off of one shot and canโ€™t handle the party life.
Johnny was too gone off of that one shot last night. He lil bro.
by tfitness February 25, 2018
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