The last name of a character ( Robbie Weirdick ) played by Dwayne Johnson in the 2016 movie "Central Intelligence". Since the release of the movie Weirdick has become a slang term for a munted, or deformed dick, hence weird-dick. Also being called a Robbie has the same meaning.
Hey Amber, why won't you suck Jono's dick? I bet it's because he's a Weirdick!