Happy-go-fuckyou is to have an upbeat F.U. attitude towards life. someone who has fun while it lasts, but is fully avare that shit will hit the fan sooner or later, and has no problem coming to terms with that.. They just don't give a f**k.
- "Hey what's up with John lately, I heard he got really depressed after he got cancer."
-"nah man, he's all Happy-go-fuckyou, living it up."