When an actor is able to work more professionally than his/her scene partner--i.e. more like Matt
Damon than Ben Affleck. If an actor were to step on his/her partner's lines or self-indulgently ad-lib in order to try to steal the spotlight, he/she would be considered the "Affleck" of the scene. Assuming the 'Affleck's partner is professional enough to at least learn the lines, so meticulously assembled by the screenwriter; and not
mug or over-emote like he were playing some
pimp in a JLo video, he would be considered the "
Damon." The saying would be employed in the
case that the scene partners were in contention as to which were the comparative "Affleck" of the scene.
Kevin
Smith:
"IF YOU(Jason Mews, portraying
Neo in a scene from "The Matrix")'RE GOING TO AD LIB, DON'T USE THE WORD "
PENIS"!
Erica(his scene partner who had previously stepped on Jason's line): "WHO'S THE AFFLECK NOW?"