Shemp(s) (‘ing) is a term made up by Sam Raimi, Scott Spiegel, and Bruce Campbell (during the time of the Evil Dead trilogy when Bruce was playing Ash) which is what they call a stand-in for actors not present to “play” their characters part themselves. It’s inspired after the Three Stooges, Shemp, who sometimes had a stand in during shorts taken when he himself couldn’t be present.
“Baby, you got real ugly”