1. Someone or something that is used to test medicine or other products and procedures.

2. A small South American rodent that looks like a miniature capibara and is kept around the world as a pet. Also used as a food in its native range.
1. Fred is a guinea pig for a pharmeceudical company and gets paid for the testing.

2. One of the class animals in my biology class is a guinea pig.
by Steve December 14, 2004
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1. A small creature that children own as pets, usually called the name of their favorite condiment. Ex: Peanut butter, Mustard, Ketchup.

2. The name for a man that a younger girl is strangely attracted too. The man is older in this case.
1. Fanny Jo: I got a pet guinea pig!
Susan Mae: What's his name?
Fanny Jo: Mayonnaise!

2. Aly: Guinea Pigs is so hot today!
Lexi: EWWWWWW!
Madison: EWWWWWW!
Ana: EWWWWWW!
Aly: What?!
by GuineaPigzLuvsAlyyyS March 10, 2010
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n. Offensive term for a particularly unattractive woman of Italian ancestry. Orig.: guinea is an offensive term for Italians, and pig describes an ugly female.
I banged that guinea pig Gina last night, but I had to bag her first.
by SkidMarkyMark April 24, 2006
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A small, cute, furry rodent commonly sold as a pet. Eats just about any kind of vegetable, comes in many colors, screeches loudly when hungry. Possesses roughly the intelligence of a cow; sheds a lot.
Origin: Comes from South America. Named either after the country of Guiana or the fact that it originally cost one guinea in England. Raised for food in Peru; considered a pet everywhere else.
"WHEEK, WHEEK" screamed the guinea pig when she discovered her food bowl was empty.
by Anon November 13, 2004
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small rodent, about twice the size of a hamster, very hyper active and the size of a fully grown hamster when young, but will grow lazy and fat. they're are not suited for any excercise and will mostly die if forced to any excess movement. though they only eat vegetables, some fruit, pellets, soft hay, grass and specialy developped food for rodents, they'll attempt to eat anything, as long as it's close enough to they're mouth. they sometimes may act blind for food, hoping to get more. many find them adorable and cute, and keep them as pet, as they're easier to care for then most other pets. they produce very high-pitched and loud noises when hungry or hearing a noise they relate to food or someone who bring them food, impossible for any creature not from the family of caviae, including humans. they're related to the capibara, world's biggest rodent, wich is sometimes also kept as a pet.

If you want to take a guinea pig as pet, remember that they're group animals and you're forced to buy multiple in order to avoid a depression. also, you should provide a compost bin, as guinea pigs produce much of that...
a fully plastic cage advised, else they'll throw much food away, hoping they'll get more and better food.
i love my guinea pig, he's fluffy and produces lots of manure for my plants in exchange for wortheless vegetables
by redharvest July 31, 2011
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Guinea pigs are a furry ball, or a potato. They have little squeakers that sound like a pig being stabbed, and can go off when they hear you, the fridge opening, a bag crinkle, or if they see food.

Whenever they eat, they make little potato baby’s. Usually after eating you’ll find a mound of these. Sometimes they’ll go back for seconds sometimes and will eat the potato baby’s.
A furry potato can also be a skinny piggy which is a peeled potato.
by Peznuttychu September 20, 2019
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Clean rodent with no visible tail. Strictly vegetarian. Comes in large variety of colors and hair styles. Sheds hair at a fast rate. Like humans, it cannot produce its own vitamin C, so must take it in it's diet. Lives 3-8 years. Usually very friendly and affectionate. Makes a wide range of noses, from squeaking, purring, chirping and chattering. Their mind control powers are pure fiction. Really.
What are you squeaking about, Kiki? I already feed you earl... MUST OBEY THE PIG. YOUR WISH IS MY COMMAND, EMPRESS KIKI.
by fred-of-fred December 22, 2004
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