Quarterbacks say a wide variety of things at the line of scrimmage pre-snap, some calls being real audibles and some just nonsense to try to throw the defense off.
For example, Carolina Panthers quarterback Cam Newton called out "even janitor" during Sunday's game against the Tampa Bay Buccaneers. Unless you play for the Panthers, you probably have no idea what that means.
While that signal is fun by itself, the sequence was made even better by someone (not clear if it was a Panther or a Buccaneer) asking Newton if it was a real call.