oh snap Definitions include: oh shoot, oh no. said when one realizes something they forgot. OMFG Definitions include: acronym for "oh myfuckinggod." OMG Definitions include: acronym for "Oh my God", a general-purpose exclamation. OMGWTF ...
as the face is unlikely to always be neutral in the real world. Any change in the expressions of the face would mean the features of the face would change, and the detection system might not consider it a real face.