Gramps
An endeering term used generally to describe a male friend who is gradually showing more and more characteristics similar to that of a grandad.

"G" used to go out pubbing all the time and never really minded spiders much, but now he has developed a sudden case of arachnaphobia and much prefers to sit at home with the wife, pipe and slippers. We used to prefer "G" when he wasn't such a Gramps!