A tracked machine with a arm attachment used to dig below the surface. Used often in construction and industry.
When a man puts his penis into a womans mouth and pulls it out on her cheek, sometimes causing a popping sound.
A drill used to impale zombies and flip them around like a merry go round striking surrounding zombies with its body.
* These videos are coming directly from Youtube, they may or may not be most relevant to the word "Excavator"