usually happens at music venues and shows when a crowd is getting into the music and start singing along. people who have listened to the band for the first time try to be apart of the crowd and lip sync along but don't sing and don't know the words.
Guy 1: have you ever seen that kid before any Vallon shows before?
Guy 2: no
Guy 1: i didn't think so i caught him fauxsyncing their whole set. he even tried to sing along to their stuff they've never performed.