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1.
A tracked machine with a arm attachment used to dig below the surface. Used often in construction and industry.
"We need a excavator to dig out that foundation"
by Puffie40 November 17, 2004
 
2.
A drill used to impale zombies and flip them around like a merry go round striking surrounding zombies with its body.
Frank West: Im gonna go down to Crislip's and fuck those zombies up with the excavator! Best watch out for Cliff though...
by ChainsawCharlie March 20, 2007