The (wo)man who goes by the name William Moseley. Is in the Narnian films, enjoys teabagging, and was raised by chickens. Often known for ~posh accent, and tendency to slur and spit when talking about squirting orange juice on the devil (aka Bin Bons).
"I had to sit through five more hours of makeup because of that WillMO." - Ben Barnes
Willmo is usually a nickname for a male called William or with the surname Williams. They think its cool but it most certainly is not. Usually from Birmingham.
"Willmo, stop being a cunt and get your Mum a Rum and Coke!"