When someone attacks you in your own home, you have the legal right to own their ass.
Crackhead breaks into your house, you yell "Castle Rule!" and then proceed to stomp their face in.
by JG1L November 13, 2009
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When the same course of events happens repeatedly, despite attemps to to stop or change it.

Background: Expression is derived from the original Super Mario Brothers game on Nintendo. Some of the Bowser's Castle levels were 'repeating castles', where the same sequence of screen would repeate continually until the player performed the neccessary sequance of actions to get out of the repetition.
As Joe and Jon walked back to their campsite, they past what looked like the same tree at least three or four times before making it back.

"Fuck, I hope we get out of this repeating castle before dark," said Joe.
by Hopewell Rocks December 11, 2009
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A large home or mansion in an affluent area owned by a black person that was able to purchase the residence without hard work (e.g. winning the lotto, becoming a famous yet untalented actor/singer, dealing drugs, etc.)
The children were told by there parents to stay away from the Williams house because it was in fact a nigger castle and they might get shot or stabbed if they wandered to close.
by Romath April 14, 2011
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The ultimate stoner fast food joint popularized by "Harold and Kumar Go To White Castle". Sometimes open 24/7, catering to potheads with a nasty case of the munchies. For fuck's sake, they actually sell a goddamn paper case filled with 30 burgers. You'll get the runs and your heart will explode...but it's really freaking good!
I'm high as shit and it's 1 in the morning. Let's go to White Castle.
by The Dude August 29, 2004
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An online testing/review program designed by sadists who enjoy seeing students of all ages cry at receiving low grades while taking online tests that score themselves automatically. Every so often the system will randomly freeze before telling you whether you were right or wrong just to increase your heart rate 10 more BPM.
Student: The Castle Learning is due at 11:59 pm tonight.
Friend: I know, I just finished it and got an 86. We only learned half the questions in class.
by Tells-Many-Truths March 21, 2016
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Noun

A supplementary glass containing some form of hard spirit, traditionally a whisky, which sits separately alongside one’s pint of ale or stout.

A punter of a drinking establishment who has a pint and a separate spirit on the go, simultaneously, is said to be drinking "castle kingside". The act of ordering this particular drinking setup — assuming the drinker is already on pints but wants an accompanying spirit — is known as “castling”, or “to castle”, from the verb castle.

The term is derived from the chess move of the same name, whereby the king is moved two squares towards a rook (castle) on the player's first rank, then the rook is moved to the square over which the king crossed. The outcome leaves the king and rook side-by-side.
Josh: “Is that Tim over there at the bar, drinking castle kingside?”

Tom: “Yeah mate, it’s not even 5 o’clock.”
by thebigthree March 8, 2020
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