seatscams

'no seatscams' is something said at parties or other gatherings where there are fewer chairs than people. When someone gets up from their chair, if they call 'no seatscams' then anyone who takes their seat must give it back when the former chair's occupant comes back. Witnesses are typically needed and enthusiastic to enforce the rule.

'Don't sit there, Rick called seatscams before he went to the bathroom'