I had one for 6 years and had to put her down last spring because she got really sick. She was my first guinea pig and is probably my last. I would like to have more, but for now my parents are enjoying the freedom of having no pets, and in the future I'll probably have a dog.
Her name was Clementine and she was the biggest eating machine that ever lived. She would squeak until you couldn't help but pity her and bring her a fat juicy lettuce lettuce leaf.
Consequently she pooped like there's no tomorrow!
She was lazy, but smart. SHe knew she couldn't pee on us when we took her out, and would hold it in. If I didn't get her "I HAVE TO GO PEE" message, which was usually grumpiness and unwillingness to purr when I petted her, she would bite me and I'd run to put her in the cage so she could pee... or when she was reaaally lazy she would just have fun on me.