Pulling a Bernard

Pulling a Bernard: Disguising yourself and pretending to be a different person in order to date someone without them realising your true identity.
As seen in the 2010 Dreamworks movie, Megamind.

Chick one: That asshole! I thought it was my boyfriend sexing me up all night. Turned out it was his twin bro!
Chick two: Shit girl, he just pulled a Bernard!

Dude 1: So, I had my hoodie on, and this dudette suddenly glomps me, coz she thought I was her boyfriend. Nearly got away with it, too.
Dude 2: Ohoho! Shit, man! You were halfway to pulling a Bernard