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Castaic is considered to be the northern end of Santa Clarita. This is in debate.

While being the supposed boundary of Santa Clarita, it is also the boundary of civilization in the area. When going north on the golden state freeway, Castaic is the last thing you'll see for 300 miles (literally).

Once in the city of castaic, its always rush hour, no matter what time to go in. You'll always be going 15 mph in 45 zones due to the idiot truck drivers that take so long to make a left turn that by the time its done, it's run 2 red lights while your stuck with the on coming traffic that had to stop for it.
Guy 1: Guess what? I live in castaic!
Guy 2: (gunshot)
Guy 1: Ow! What the hell?
Castaic by Robert Wageman December 10, 2007
Related Words
A community just north of the city of Santa Clarita in Los Angeles County. Mainly known as a truck stop and for a lake. The community includes several quaint cookie cutter homes, some friendly people, a detention center (jail), and (quiet neighborhoods with exception of a loud Freeway). Many people flock to this community because of its good schools, moderately priced semi-new homes, and also an opportunity to say that they “live in Santa Clarita”, when in fact they don’t.
Person 1: I just bought a home, escrow closes next week:
Person 2: Oh how nice! Where?
Person 1: Out toward Santa Clarita
Person 2: Ooooooh Really!!!???? Where abouts?
Person 1: (sigh) Castaic.
Person 2: Oh...well, that's nice.....I guess
Castaic by Alotta Nothin October 29, 2012
-smallish town about 20 minutes away from "the valley"
-LA county
-mostly whites and mexicans
-go to west ranch high school and valencia
-lots of teens
-10 minutes away from Santa Clarita
-by Town Center Magic Mountain
A:Castaic is so much better than santa clarita, huh?
B:Basicly yeah, but i dont know they seem more spoiled and stuff
A:Yeah true I think we're like the ghetto behind Newhall
B: But not really we're pretty spoiled
A: Oh yeah huh
castaic by abcdefg1234567! January 2, 2008
North of Santa Clarita. Aka the armpit of SCV. If you think canyon country or Newhall is trash, then castaic is even a worse version of both those cities combined. Think of castaic as a shitty version of the valley with a bunch of trashy low life people who inhabit this city. Disgusting filthy city. Then again it’s on the way to Bakersfield which is one of the worst shitty places to live in Cali. Castaic will make you appreciate Santa Clarita. It’s an embarrassment Castaic would be included under SCV because it’s so much worse. Ugly sketchy people live here and you will appreciate living in Valencia, old Valencia, Newhall, and even canyon country. Stevenson ranch is the most desirable area. Castaic takes the cake in terms of undesirable cities in Southern California. Feel sorry for anyone that lives here.
Oh, Castaic. The ugly shitty city filled with trashy sketchy people. Think of this as a mix of the valley and Palmdale which is the worst mix ever. Not only is the city ugly, ghetto, and trashy, but the people who live here are garbage human beings. You will appreciate SCV (Santa Clarita Valley) once you visit shitty trashy Castaic.
Castaic by DrCumtastic May 4, 2024

casticle 

A name for someone who is both a dick and a pussy at the same time, implying that they were castrated
Person 1: Did you hear about Samantha’s boyfriend?

Person 2: Yeah, hes a total casticle

Castic Spunt 

The spoonerised version of "spastic cunt" except this means that somebody is acting severely autistic and/or more abnormal than a "spastic cunt"