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(Noun) A small, purple, rat-like creature only found in the fictional world of Pokémon. Since 1999, these rodents have managed to destroy the childhoods of all those who have played the game (Pokémon) and lived on to tell the tale.

Being known to attack when making sudden sharp turns or riding a bicycle in tall grass, one can justify that this is one of the main reasons to why the teens of today are so irritated and, on occasion, extremely flamboyant (see 'scene kids'). It is also a major cause for severe mental disabilities due to the loud, sudden noises this creature brings when it appears.
AH FUCK! I'm out of repels. Alright... move very slowly. Don't make any sudden movements...

*RING RING RING* A WILD RATTATA APPEARS!

FFFFFUUUUUU-
Rattata by Miragemelody August 19, 2009
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Ever met the kind of person who you don't really like at all, but who has the annoying habit of constantly appearing almost everywhere you go? That's a Rattata. The Rattata is the person who you can never seem to get rid of short of taking out a restraining order (and even then they'll find a way around it). They don't seem to get the message that they're not wanted around.

Named after the Pokémon Rattata, which is one of the most common (and annoying) Pokémon encountered in the wild.
Hey Richard, stop being a Rattata and piss off.

That Simon is such a Rattata, I wish he would just leave me alone.
Rattata by Loquacious_T March 27, 2011
Rattata, a usually always Lvl 3 piece of shit pokemon. It is always is the starting areas and they come up out of nowhere to fight you. No-one shows this pokemon respect as it is a weasel rat.
A Rattata appeared!

Gamer : Yeah...no. (Runs Away)
Rattata by Legs You Legend October 29, 2009

top percentage rattata 

1. Youngster Joey's low level (like REALLY low level) Rattata which is defined as, "Top Percentage" until you beat the shit out of it with your Level 5 Cyndaquil
Remember my super cool Rattata? My Rattata is different from regular Rattata. It’s like my Rattata is the top percentage rattata"
top percentage rattata by Coolcat858 November 26, 2014
An amazing electronic band that we rarely see in the music world.
My girlfriend asked me to put music on while we fuck. Ratatat's wildcat stimulated the hard thrusting my girlfriend received.
Ratatat by bobbyk91 August 16, 2009
When hussain is in the getto he goes ratatata
i'm in the getto, ratatata, ratatata Ahuah
Ratatata by iLikeGun December 19, 2019
“I’m in the ghetto...ratatata....ratatata!” ~ meme by @mukhtarhuh (on tiktok and instagram)
ratatata by rutiee December 29, 2019