A patient in very bad shape, usually non-responsive, with the mouth open in the shape of an O. The dotted O-Sign describes a fly on the forehead. Q-Sign = O-sign with tongue protruding from the corner of the mouth. Example: Doctor Jones, Mrs Campbell is doing poorly; she's showing the O-Sign all night long.
O-SIGN
Meaning of O-SIGN in English
Slang English vocab. Английский сленговый словарь. 2012