What does it mean to make a gesture of scissoring hands on both sides but bending inward (forefinger and middle finger bending inward) in American drama or European and American life?

Generally speaking, this gesture will be preceded by so called, so you can understand it as irony, and there will be a little irony in it, such as: he is that so called hot. It means that he is the "handsome guy" you said. I don't think he is handsome.