To be gay with one's self. Also to have "gayness".
Man, he is very fain with Joey.
1) A cockmaster
2) A true G
3) Someone who invites friends over so when they're asleep he can take pictures of them and secretly fap close to their heads
Guy 1: You're a cockmaster, Fain
Guy 2: Safe as fuck
Guy 1: That goal was G, you're a G Fain
Guy 2: I know
Guy 1: Oi, did you go round dave's house yesterday?
Guy 2: Ye, he was a right Fain, I woke up and his cock was really close to my head, and he had his camera out