When you eat a lot of corn and the next day you poop, theres a bunch of corn in it. When you poop a huge log of poo it looks like its a lock of brown poo with yellow specks.
Guy walks out of bathroom with a smile on his face.
Guy 2: What are you so happy about?
Guy: I just shat out a HUGE goldy lock
A Penis that is generally said to be of perfect Length and Girth.
Janet: I slept with Ed last night...
Mandy: Really? How big was his junk?
Janet: Well, it wasn't too small and it wasn't too big...
Mandy: Oh, he's obviously got a Goldilocks Cock then.