yawn flaps
Momentary loss of hearing accompanied by a slight loss of pressure when yawning, causing the sufferer to become temporarily deafened to comments from others.
"What was that Gerald, I didn't quite hear that I had my yawn flaps on"
"Hes being a right dick today, I'll tell him when he's got his yawn flaps on"
"Hes being a right dick today, I'll tell him when he's got his yawn flaps on"