When you have anal sex with girl, and then switch to vaginal sex when she is on her period.
From the Chicago Elevated Train lines, Fullerton is a stop where one can transfer from the BROWN line to the RED line.
My girl was on her rag, so I was fucking her in the ass. I really wanted some pussy, so I did a fullerton transfer.
by m3nni March 25, 2005
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A Chicago Transit Authority El station that connects the Red, Brown and Purple lines. In this case, it involves going from the Red to the Brown, or the Brown to the Red. If done right, it'll leave Purple bruising.

For additional style points you can give her the "Skokie Swift" (Yellow line) and hose her down in a golden shower.
"I rawdogged this chick's bloody snatch then I flipped her over and gave her the Fullerton Transfer."
by Mrs. O'Leary's Cock March 12, 2010
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A Chicago-ism for moving from the pussy to the ass during sex. As in transferring from the red to the brown.
(katy): one of his coworkers buddies met this older chick at a bar in the burbs
(katy): and they ended up going back to his brother's basement to fuck on hte couch
(katy): and they're going at it, and she asks him to put in in her pooper
(katy): so he did ("the fullerton transfer")
by Crapple0 May 16, 2006
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Adam Fullerton is a backstabbing lying wee bastard that has no friends and spends all day everyday on his playstation. He is well known for going into his house afterschool and going down to his knees and crying to his mam saying he is being bullied but he is the bully. If you know an Adam Fullerton don't even say hello to him or he'll go to his mam and say that someone touched him and in no tim his mam will be on the phone to the police lying to them.
Adam Fullerton is a cunt.
by Th30n1ywan December 5, 2018
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A transfer from the Red Line to the Brown Line
A Fullerton Transfer occurs a guy is having sex with a girl and then pulls out of the girls vagina and puts it into her butt.
by Chris Slattery August 19, 2006
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California State University Fullerton. Home of the 4 time National Championship Baseball team: the Titans. Men's basketball ain't too shabby either.
Who's playing in the NCAA game this year?

Oh, Cal State Fullerton AGAIN!?
by Le Titan November 13, 2005
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A California State school currently boasting more than 35,000 students. It is located in the Mecca that is Orange County; 5 minutes from Disneyland, 30 minutes from LA, and 25 from the Beaches surrounding Newport. It's most popular majors are Business, Communications, and Fine/Performing Arts.
A Typical day at California State University Fullerton:

What do you want to do for lunch?

Let's go eat at Disneyland!
by Le Titan November 17, 2005
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