A pet usually a dog or cat that is only found cute or adorable by its owner. A nasty pet is often seen at a friends home where it will start to rub their greasy ass fur and diseased eyes all over you the second you enter the home. Your friend wont get them off of you but instead smile and think that it is cute.
I almost threw up when I smelt that Nasty Pets breath.

my friends Nasty Pet shit all over the carpet and then ate it my friend thought it was so cute.
by Dr. J3 February 26, 2012

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