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A Pigrat (or Pig-rat) is an undesirable person, not just a pig, and not just a rat. They are a Pigrat.
You fuckin Pigrat, stop stealing my beers.
by Notgettingmuchatm March 04, 2006
Adjective: Two of the dirtiest animals commonly know. Disgusting. A large mess.
After the party his house was hella Pig Rat.

Look at the girl who has a genital disease, smells and hasn't brushed her hair. She's Pig Rat

Dog you need to clean up your room, this shit is Pig Rat.
by DVC1 June 20, 2006