Other mistake: When we first see the Saito Gemu HQ, the shot is mirrored. It is apparent by the reversed company logo sign. (00:14:25)
San Junipero - S3-E4
Continuity mistake: Near the end, Yorkie gets into a red left-side drive convertible, then is seen driving on highway in the same car but with right side drive. Following scenes are of a left-side drive car. (00:58:00)
Continuity mistake: The way Kenny holds the gun during the robbery changes between shots with no time for him to adjust his grip. He goes from holding the gun using his right hand with his left hand wrapped around his wrist, to holding the gun with both hands. (00:37:49)
Answer: It's a derogatory slang term made up for the show.