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a person who is being extremely annoying. It is a combination of the words rat and asshole. It can be used in anger or towards a friend in a joking matter.
Wow omg I cant believe you stole my cookie, you’re such a rat hole.
by ultimate rat February 26, 2020
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Nov 27 Word of the Day
A stupid person; it refers to the lack of surface area on an individual's brain. The general thought is that the more surface area (wrinkles, creases, etc.) a brain has, the smarter the person is. Conversely, a person with a smooth brain (no wrinkles) has less surface area and would therefore be stupid.
That fucking smooth brain put his shirt on backwards again...

That smooth brain is dumber than a pile of shit.
by Tip Tank May 14, 2011
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A place where you put some money to save that no one knows about.
father to son...... Son, you better rat hole some money.
by steven algren December 28, 2008
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To digress in an extensive way. To divert the conversation to a topic that is not only unrelated to the topic at hand, but a topic that will likely have no immediate resolution either.
That's an interesting discussion, but let's stay on track and not go down a rat-hole.
by The Colonel July 18, 2003
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Made famous by the TWIT podcast Macbreak Weekly, a rat hole is when a discussion follows a constant tangent and ends up with a topic that has nothing to do with the original discussion.
That discussion of Macs which changed into a discussion of classical music was quite the rat hole.
by Steven Legault January 21, 2008
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A topic of conversation that has diverted wildly from the original conversational thread and is generally viewed by all (but the one leading the topic) as being without resolution, or at the very least is uninteresting to others in the group. Ratholes usually open up when related but tangential topics are discussed which are explored in much more detail than is required for the relational reference to the original thread.
I was trying to keep things on topic, but you've opened up a big rathole with all this talk of comic book plot twists.
by Stark Raven Mad August 02, 2007
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A person or friend, outside an entity to secretly move money or launder money making it appear to have earned money legally.
He persuaded friends outside the company to act as “rat holes”, handing them stakes in each new issue, which would belong to that person on paper, but which, in fact, would be originator's money and originator’s stake.
by unirobber January 04, 2018
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