Most likely originated in the armed services, probably during Vietnam. "Kick ass" is generically applied to beating the opponent, whereas taking names refers to killing the enemy, or "taking their names." Has been adopted into common usage as a general motivational statement.

A girl that can go off at any time and be absolutely savage and correct at the same time. It's extremely hot.

The act of being unequivocally awesome. It generally involves showing people what's up, making people feel like morons for being wrong, and defeating terrorists. It is indeed an action worthy of the highest honor.

It refers to an older sayings "Kick ass first, take names later," or "Shoot first, ask questions later." Generally, it is frowned upon enacting such awesomeness without "asking questions" first. However, when used in this context, that much is forgiven.

when you are too busy kickin asss you have to take initials

When you are so good at something, people are lining up to challenge you and you have to give them a number and they have to wait their turn.

This expression does not date back to Vietnam or the 80's. it is ancient in the marine corps and is what drill instructors did up until the mid 70's

Kick their ass instead of smacking it