A woman that is so vile and disgusting, sensing her around you makes your body tense up and you feel like you are about to shit yourself
Man, did you see how much sarah ate last night, what a fucking rat pig.
by Dan Monty May 23, 2008
Someone who has the features of a rat and the body of a pig. Eg someone with over-sized teeth who is on the chubbier side
"Look at that small RatPig!"
by Libertino September 09, 2005