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The art of acting by using your back as defined by Will Ferrell in this video,

Note: It's the concatenation of back and acting, bacting.
Bacting occurs when two actors are in the middle of a dialogue and the position of the camera shows the back of an actor and the face of the other actor in the conversation. The expressions made by the back-faced actor is bacting.
by Kyle N. June 29, 2008
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The term used to describe actors acting in the background of any film or TV show; see also: bactor.
Bacting deals with the ability to portray real people without the use of lines from a script.
by naopowpow September 16, 2014
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