A bastard who is characterized by devious and base intentions.
That rat bastard who ripped me off on the car deal also hits on my sister.
by Will March 17, 2003
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A despicable person.
Someone easy to hate, usually for a good reason.
It is normally related to either extreme personality flaws or actions commited counter to human decency.
"What kind of rat bastard psychotic would play that song right now, at this moment?"
- Raoul Duke (HST)
by Vladicus March 14, 2005
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an completely wretched and despised person
by Light Joker November 15, 2004
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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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a person who intentionally or unintentionally causes issues which annoy you.
you rat bastard!! Who said you could use a simple material, when my instructions clearly outline using a color material???
by H!ghPla!nsDr!fter August 26, 2009
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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
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A song by the ska/punk band, Mustard Plug.
On the album "Im Black and White"
You told me I'm a real rat bastard
I'm telling you I can't deny it's true
But step inside this real rat bastard
You be me and I'll be, I'll be you
by uhohashley December 6, 2008
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