A slang term for someone who is an asshole. Guests checking into a hotel usually leave their brains at home and take out all frustrations on the poor desk clerk. These people are referred to as cockers.
That customer was such a cocker. He was a fucken cocker.
The way he talked to me was if he was having a cocker-fobia attach. I hope that the bouncer at the main door does not cocker-fy you because I have heard that he is a total cocker!!!