I was playing yesterday and I got a fair amount of skillshots that I thought were awesome, so I figured I'd post some of mine here.
 
Killer News - Kick a news bot into someone, and it'll kill them and anyone else near.
 Sausage Fest - Blow up a hot dog stand near some bad guys and it'll kill them.
Breakdance- This one is hilarious, you shoot an enemy on the ground with the drill gun and they get nailed to the ground and start spinning.
 
I've gotten others but these were just some of the ones that stood out, post some of your favorites and how to do them here.

Gang Bang always makes me chuckle.

Killers news was pretty damn funny.  Friendly fire is a good one:
you get a dude killed by another enemy's fire.  This works well with the guys who shoot the pistol charged shots.  I was in the level before the remote controlled dino.  The pistol dude shot at me from long range and another guy popped out right in front of me.  I kicked him into the charged shot sending him into a nearby electrified building.  That was awesome.
 
Edit: gotcha is cool.  Thats when you leash a dude who you can't leash, I think.  I've found flailing a fast dude then leashing him and killing him works.

I got X-Ray (charged AR kill of two or more guys at once), Overkill (charged AR headshot) and the one for killing an enemy as soon as he enters your crosshairs on 4 guys all at once. It was sick.

Sausage Fest is probably the one where I got the most points.  That or Firefighter.

" I got X-Ray (charged AR kill of two or more guys at once), Overkill (charged AR headshot) and the one for killing an enemy as soon as he enters your crosshairs on 4 guys all at once. It was sick. "

" @Getz said:

" I got X-Ray (charged AR kill of two or more guys at once), Overkill (charged AR headshot) and the one for killing an enemy as soon as he enters your crosshairs on 4 guys all at once. It was sick. "

I think some skillshots can't be paired up, but do you know if its possible to charge Rifle shot two guys in the head so you can snag x-ray and overkill? "

I got over 2000 points by getting drunk, firing a flare in a small room and then using the thumper. Mad Combo points!!
 
There's some cool boss killing unique ones but spoilers so.....