noun. The person that tests something out first because other people are scared; Similar to a crash test dummy
Usually used in bmx biking culture
"I'm not even gonna look at the landing, I'll just guinea pig it."
"Hey wanna see that new pirate movie that I don't know anytying about?"
"Yeah, but I haven't heard anything about it either so let's guinea pig it."
"I was biking with some buds yesterday who build a new jump at their trail and they made me guinea pig it."
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.
2. One of the class animals in my biology class is a guinea pig.