name givin to machine gunners in vietnam. because the sound of a machine gun would usually wake everyone up in the morning. in an ambush or blocking position the machine gunner was always supposed to fire first.

also machine gunners where called this because they sometimes fought out of fortified positions like nests. hence rooster nest.
"man the rooster in my squad got like ten confirmed kills today"
by cyclic rooster April 23, 2009
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To rooster means to play your music very loudly while driving with your windows down. Much like a rooster crowing loudly to everyone around. Also common to do this early in the morning to act as a rooster and wake others up.
person 1: "Damn dude, I woke up at six today.!"
person 2: " right? It was Jason going around our neighborhood roostering!"
by regretful taco May 18, 2015
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1 The stupid fucking cunt of a bird that crows next to the door every fucking morning.
2 the stupid bird that attacks you for no reason and squawks at any fucking thing it does'nt like.
That fucking cunt of a rooster is crowing outside the door again. Stop squarking you useless fucking rooster.
by Strayan cunt December 19, 2019
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Someone who is an absolute plug, lazy, annoying, or who chirps excessively. They try to act tough but they are really just an aspiring girl scout.
Brian: Yo you seen that new kid?
Johnny: haha that kids a straight rooster.

michael: hey buddy sweet shot
Cam: yeah the bench is over there ya rooster
by timmy turner99 June 07, 2014
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