A popular military term to describe a serviceman/woman who is selfish and inconsiderate, whom puts him/herself before others. In short, a person who acts alone and not as a team player.
"Oh I see you've made yourself a cup of coffee, but didn't ask us, you jack bastard "
Alternatively "So you tidied up your own work area for the inspection, but didn't do the rest of the teams who were out in the field? Now they are confined to camp, you jack bastard"
When a person consumes as much food and beverage as possible when ever possible. Most common at office parties, family reunions or dinner at a friends. Often after wards the person is seen holding their stomach complaining or seen making several trips to the bathroom.
Tim: "did you see Keith, Christ he's heading for his seventh helping"
Doug: "what do you expect, it's free."
Tim: "what a Pig Bastard"