(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...
Pulling your cock out of female when doing her doggy style, then placing the cock by the rectum and rattling it back and forth between the ass cheeks to see if she is interested in some anal.
I was nailing Kristen last night, and in the midst of our session I did some Rectum Rattling. As usual, I was denied.