Undesirable who is also a rat (informant).
Your brother's nothing but a rat bastard. He ratted me out to my PO.
by Fuhgetaboudit February 13, 2005
A bastard who is characterized by devious and base intentions.
That rat bastard who gave ripped me off on the car deal also hits on my sister.
by Will March 17, 2003
A "Rat Bastard" is one of the biggest swine that you will ever meet in life.

They will fuck you over any chance they get.

Most of the time, they are sociopaths.

Many times, they are Christians.
Many of the modern day Christians don't believe in "cause and effect," or feel responsible for their evil actions.
They wrongly think that they are "Saved" no matter what they do.

This screwed up concept creates crazy, hypocritical personalities that will fuck you any chance they get.
"Reiner is one Rat Bastard. He cheats on his mistress who cheats on his wife."
by Sara Smiles October 29, 2013
an completely wretched and despised person
Get off my case you rat bastard.
by Light Joker November 15, 2004
An extreme bastard; a real asshole. Frequently used by middle-aged trailer trash women to describe the ex-boyfriend who beat her.
I told that RAT-BASTARD if he ever hit me again I would call the law.
by Willis August 07, 2003
A supposed human who is actually lower that a human being, but to make things worse, is able to pretend to be a human being. Someone who'd likely steal from his own brothers and suck up to his in-laws
That Rat Bastard PW sucks his stupid mother-in-laws ass while never visiting his own momma
by Krakz Artimius December 01, 2006
the most annoying little shit on the earth who bugs you all the time
Jon Finchen AKA the greaseball
Dan Barber or wee man
by CrispyFried May 14, 2003
used to describe people or things that piss off or annoy you in anyway. used only when describing the object and not to directly insult it. not to be yelled or shouted.

coined by "The Chief", June 2000 RIP
In response to the spider creature that knocks you over in Legend of Zelda:
"aaahh you little rat bastard"
by Chris and Andy July 13, 2008

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