Couch Commando know it all

Person who plays militaristic fps all day while giving quotes on ranges of guns and whats possible in real life in military situations when he has not been in any military service. Couch commandos are usually very obese.

When I was playing online and complained about someone shooting me across the map the "couch commando know it all" than said it was possible and gave me the ballistics maximum range under a controlled environment and than said see its possible.