Okay, here's another of those "which term do you use" questions.
You know that game when you see a VW Beetle and you hit the other people in the car? Well, do you use the term "SLUG BUG!" before you knuckle them in the arm or do you scream out "PUNCH BUGGY!" and then wail on them?
I grew up sith 'slug bug' but the kids up here do the punch buggy thing.