A swing flaw in which the lead elbow bends at an angle pointed away from the body, usually resulting in a blocked or pushed shot. (Once Jack's PGA Professional saw him, he knew the cause of Jack's loss of power was his chicken wing position at impact.)

when the forward elbow joint (left elbow for right-handed players) collapses (flexes) out away from the body at impact and beyond, giving an awkward wing-like appearance and creating a variety of poss [..]

In the chicken wing a golfer makes a swing mistake. His leading elbow bends at an angel and points away from the body. A blocked or pushed shot is typically the consequence for this wrong body position.

  A swing flaw in which the lead elbow bends at an angle pointed away from the body, usually resulting in a blocked or pushed shot.

A flared out elbow.

A swing flaw in which the lead elbow bends at an angle pointed away from the body, usually resulting in a blocked or pushed shot.

At address the elbow of the right arm is pointing downward.  Should that elbow begin to point less downward the upper arm and the forearm take on the position of a wing.  Anatomically it could be described as an “internal rotation of the upper arm combined with elbow flexion.”

A swing flaw in which the lead elbow bends at an angle pointed away from the body, usually resulting in a blocked or pushed shot.

The golfing phrase chicken wing refers to a swing flaw. A blocked shot often results when the lead elbow bends at an awkward angle away from the body and looks similar to a chicken wing.

A swing flaw in which the lead elbow bends at an angle pointed away from the body, usually resulting in a blocked or pushed shot.