An annoying voice that has not yet gone through puberty and is currently playing M rated games or "cool" games and clearly sucks. This person could get easily annoyed if nothing goes their way.
Squeaker: "IM GONNA KEEL YOU!!!!"
*Get's shot*
Squeaker: "STOP KEELING ME!!!!"
*Get's spawn killed*
Squeaker: "HAACKER!!!!!!!!!!!!!!!!!!!"
by xmancrushmonday April 14, 2015

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A person, usually using a chat feature in an online game, who is young enough for their voice not to have deepened. This makes it high-pitched and unbearable to listen to. Squeakers usually use long streams of invective to make their point clear.
(Squeaker gets killed, trolled, and otherwise annoyed) Squeaker: What the fuck you fucking asshole you're cheating you're using a fucking hack I'm going to fucking report you you fucking piece of shit.

(Squeaker scores a minor victory) Squeaker: I'm the best player in the world suck my balls you fucktard... You get the idea.
by CalvinandHobbes September 24, 2013

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A kid that hasn't reached puberty yet, This child is most likely under twelve (12). This child swears a lot because (most likely) he thinks it makes him cool. Squeakers normally have a very short temper and they either put the microphone too close to their mouth or they just scream their little heads off when something doesn't go their way. Some Squeakers will talk about sex a little bit too much (meaning a lot).
Squeaker That Doesn't Get His Way: *Screaming* YOU FUCKING KILLED ME YOU FUCKING FAGGOT I WILL FUCKING KILL YOU YOU LITTLE SHIT! HACKER! MY DAD WORKS FOR THE GOVERNMENT SO HE WILL FIND YOU AND KILL YOU YOU FUCKING IDIOT! I WILL FUCK YOU AND YOUR GIRLFRIEND YOU FAGGOT!
by GodzillaHitler October 07, 2014

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A child around 6-11 prepubescent who plays fps games and has a high-pitched voice.

Often times , a squeaker will say a few words and then get verbally abused by anyone on the current game server.
Squeaker: Hi

Everyone Else: KILL YOURSELF YOU FUCKING SQUEAKER FAGGOT NOBODY WANTS TO HEAR YOU TALK YOU'RE SO FUCKING ANNOYING FUCKING KILL YOURSELF PIECE OF SHIT STOP TALKING.
by FarkRegal July 21, 2014

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A general word for any 'Kid' who plays video games and has a high pitched voice.
Person 1: Dude, i was stuck in a game with a squeaker yesterday.
Person 2: Ha, sucks for you.
by TheGo@t March 17, 2015

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Squeaker - Child video-gamer who uses the mic. Usually refers to children who play
first-person shooters, esp. the Call of Duty series.

The age range of squeakers is approximately 4-12 years old. Squeakers tend to
have extremely high-pitched voices and use the mic heavily in foolish and annoying
ways.

Usually, the younger the squeaker, the more ridiculous amounts of profanity they will
use.
6-year old squeaker on MW3:
You fucking motherfucker! Stop fucking using the fucking MP7 on fucking CoD! Imma fuck your
mom, you piece of cock-sucking faggot piece of shit!

11-year old:
Dammit, stop camping, you fuckin' camper!
by Lord of the Chings December 23, 2013

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An under-aged child online that defined to popular belief is most annoying and large portion of the Xbox, PlayStation, and even PC. Loud, annoying, and they act like adults using innuendos as well as cliches from most original ideas. They are more shown to be on the immature side.
Great, there's another squeaker in the game!

Get out, you dumb arse squeaker!

"OH YEA, I AM SUCH A SQUEAKER!!! people so 'gay' these days!"
by Andymius September 20, 2014

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