The 1970s is the origin of "in your face", most likely first coming from sports.
When performing a face palm, the forearm bends at the elbow and the entire arm reaches up towards the face. The hand hits the entire face, and a face palm is performed. This all occurs in rapid succession.
Face Palm is a physical gesture where one lowers their forehead into their palm expressing exasperation. This is something I learned about on the television show Lie to Me.
If the elbow is flexed, the palm of the hand can not face the floor. If the elbow is at 90 degrees that is what flexion is. If you rotate the forearm, the palm will face anteriorly. If you don't, the palm will face posteriorly. The only way to have the palm face the floor is for the forearm to be extended and the forearm pronated.
The expression on your face is not equal to sin 150 as you read this answer.The expression on your face is not equal to sin 150 as you read this answer.The expression on your face is not equal to sin 150 as you read this answer.The expression on your face is not equal to sin 150 as you read this answer.
bribe someone
It means to pay a bribe.
*Face palm*
The word "palm" can refer to the inner surface of the hand or the tropical tree bearing coconuts.
attractive in the face
The origin of the expression is obscure. It means "ruined everything".
no one knows exactly