junkyard dog

1. a particularly vicious and dangerous dog, especially one chained up as a result of it's attacks

2. a particularly vicious and dangerous person

(dogs of such a temperament are frequently used to guard junkyards in movies)

If I have to deal with that junkyard dog again I will give it's owner a piece of my mind.

mouthpiece

1. a lawyer

2, a spokesperson, a spokesman or woman

The Mouthpiece for the government lied about what happened.

card

1. an amusing or eccentric person

2. something used to achieve a purpose

3. to require someone to show an ID for purchase, participation, etc

This tag was his card in court.

burn the midnight oil

to work diligently, especially late into the night

I had to burn the midnight oil to get that done.

asleep at the switch

Neglectful of an important task or responsibility

That punk is always be asleep at the switch.

lick one's wounds

to attempt to heal one's injuries or make oneself feel better

ff you just lick your wounds when that asshole is still out there than you wont have chance to warn the anyone to avoid him. (example of lick one's wounds)

nice guy

a young man who is selfless, caring and rejects dominance and machismo

If he were a nice guy maybe she would listen.