Christmas Adult

Like a Disney Adult : adults who are obnoxiously into something which is geared toward children. Christmas adults will often say “it’s almost Christmas!” before the leaves have even started to change color, listen to Christmas music and watch Christmas movies year round, and leave up Christmas decorations up from September to February.

“Dude, did you see the neighbor’s house? They have a “Season’s Greetings” sign up already. It’s September!”
“Yeah, they’re just a Christmas Adult”