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slang A vagina. The term was popularized after being used on a 2006 episode of the TV show Grey's Anatomy, whose writers chose it due to censors' objection to multiple instances of the word "vagina." I'd really rather not have to talk about my vajayjay in front of your parents, so let's not bring up the birthing class.
slang A police officer, or the police in general. I can't even walk down the street these days without Peter Jay hassling me for no damn reason!
n. a marijuana cigarette; marijuana. (Drugs. From the initial letter of joint.) A jay will cost you two clams.
n. a nickname for a police officer. You walk straight, or Peter Jay is going to bust you.
n. dope; junk. (Underworld. Pig Latin for junk.) The creep deals in unk-jay, you know—narcotics. Stay away from the unk-jay.