A skittish little creature, who will farm every shred of carpet you have if it sees one little speck of what may or may not be meth. Usually travel in packs, and can often be found where there is copper or catylitic converters.
Woke up with my catylitic converter gone. Followed a trail of copper pieces and body odor to an abandoned building, where I discovered a herd of tweakachu chewing the coating off a pile of wire.
A female tweeker that shakes her ass, has chubby cheeks, doesn't speak in full sentences, and generally bounces around like a squirrel. Resembles the Pokémon character Pikachu in their bouncing around actions and demeanor.
Guy 1: "Oh my god dude I'm so worried about my cat and I hope I didn't leave the stove on and I think I left my front doorunlocked."
Guy 2: "Stop being such a Tweakaholic."