to pull an E.C.

Basically it means the same thing as pulling a 'disappearing act'.
It all started out from the movie Twilight and E.C. stands for Edward Cullen Character. When you pull an E.C., you have a tendency to disappear from time to time. Edward Cullen disappeared on numerous occasions throughout the movie.

Are you going to pull an E.C. on me?
Did he/she pulling an E.C. on you again?