A phase during adulthood when a man first develops moobs. Usually begins in mid to late 30s but has been known to happen in late 20s in some male office workers.
Larry: Holy crap Frank, I didn't know you'd reached mooberty already, your moobs are huge!
Frank: yeah it sucks, I've started getting moobsweat too. I wish my mother would buy me my first man bra.
When you're going down on your girlfriend put your lips inside her pussy and blow as hard as you can until you hear the sounds of a Mobertucky Muffler.
I left the Wabash with that girl from South Park and gave her a Mobertucky Muffler behind a dumpster.