Prisoner of Man. Pikachu is the only one of Ash's pokemons that has not evolved yet over the course of years the show has been on-air. It is infer that Pikachu isn't allowed the freedom to express his true self and venture out into the world because of Ash's strict restriction he has on him.
Matt: Living at home suck when I'm going to college. My parents treat me like I'm still a kid.
Drew: That sucks man, but just be glad your not a Pikachu!
Matt: Haha, your right. Anything is better than that!
by Abby_08 May 17, 2009
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Epic yellow object made from Chuck Norris's guts and Charlie Sheen's blood. A living Tesla Coil. If his lightning was projected in real life, it would be around a hundred million volts, and a few hundred amps. AKA Deadly but awesome. Pikachu hates going into Pokeballs, and controls children's minds through it's total epicness. A male pikachu has a pointy tail, and a female has a heart. Pikachu is the god of adorable, fluffy things and is an apprentice for the god of high voltage, Nikola Tesla. Pikachu might cause seizures when zapping missiles though. Other than that, a tame one is extremely cuddly. Pikachu lost a lot of weight from the first season to now. That doesn't mean he's any less adorable and cute!
Today's kids will never know why Pikachu is always out of its pokeball... Pikachu, Plusle, Minun, Pachirisu, and Emolga are all related, according to Bulbapedia. Also, you can tell by looking at them. They all have circles on their faces, and they are all tiny, and they are all cute as fuck.

Joke: What is an electric Pokemon's capacitance measured in?

PIKA-FARADS!!!
*Pika, pico meaning 10^-12, geddit?*
by Fractal-Pterodactyl December 10, 2011
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1. A fictional mouse pokémon
2. Used in memes, "peek at you"
When you're in the shower, I'm gonna pikachu!
by DinoCoat March 29, 2017
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A mutated crossbreed of a mouse and a rabbit, commonly painted yellow.
Randomly generates large amounts of electricity.
Currently being assessed by government scientists as an alternative energy source.
One day you'll plug your lights, your computer, your appliances, and your crappy electric car that goes 5 miles an hour into your Pikachu
by ashketchum May 27, 2008
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A yellow rat that shoots electricity
Me: bro I just caught a pikachu!

Friend: lucky, I only caught a deoxys
by Hitler the great November 30, 2019
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Pikachu is the most perfectest pokemon ever. Can combine with squirtle to form squikachu. This is eminently awesome. OMG IT'S SO CUTE.
LOOK PIKACHU SOOOO CUUUUUTE!
by IH8DaCubs22 February 28, 2010
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1. A sexy little mouse that live in my garage.
2. A creature in Pokemon, used for beastiality, especially utilized by it's owner, Ash Ketchup.
3. A stuffed animal used by old men, especially recommended with viagra.
Pikachu! You are so horny today!1!
by Pikachu_Lova May 23, 2005
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