A Fay-Jay is a reference to a pocket pussy, artificial vagina, or male masturbation toy.
I heard kyles mom searched his room last night and found his fay-jay in the dresser, she’s pissed!!
When you give a facial to a woman and then she gives you a blowjob after to clean your dick of cum.
"Hey girl give me a Fay-jay when we finish tonight"
"Get up and take this facial....now clean it all off. Thanks"