Someone who talks about consuming lots of alcohol on a given night, but when the time comes, the person drinks an incredible amount less than he or she said they were going to consume.
Wow Franklin, you said you were going to drink a case of beer and you've had 4. You're being a birndog tonight.
The act of trying to mate with the most attractive women at the bar often done through the use of excessive alcohol consumption. Usually accompanied by peacocking, mating calls, and showing strengths of manhood.