noun; A person who was very popular, happy, and had tons of friends as a child but grew up alone and jobless. Usually ends up turning to drugs for comfort.
Friend 1: Remember that one kid from high school, Alex, I think? That kid was craaazy, we had some fun times with him!
Friend 2: Dude that kid was always the life of the party! What ever happened to him?
Friend 3: I saw him in the paper for possession of cocaine and marijuana.
Friend 2: Wow, what a Macaulay Culkin.
masturbating in the bathroom while your roommates are out and are unsure of when they'll return; IE, maturbating while home alone.
Pun on the word "caulking" (pronounced "call-king"), the rubbery silicone sealant around tubs and sinks.
roommate: What the hell were you doing in the bathroom when I got home? You were in there for a while.
deviant: Oh just Macaulay Caulking the bathtub tiles... you didn't leave a note so I didn't know when you'd be home.
roomate: gross