A facial expression that represents your total lack of respect for something someone has just said or done. Your lips are dropped into an upside down U shape, eyes are slightly squinty, while the eyebrows are raised exclamating a total feeling of shock and disgust. Your face should reflect that of a fish. If executed properly, the receiver should feel shame and embarassment, while onlookers laugh on histarically.
Cory suggested we (all guys) should go to the drive in together, so Jeff dropped a fishy face on his ass. Cory was put to shame for his ridiculously gay suggestion.