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2.
an individual fucked up in the head so much that he assumes a stone or pebble is able to render a tank or other heavily armoured vehicle immobile.
The rock lobber assumed his skipping stone would penetrate the 8 inch thick armor of the tank
by sn0wmann November 28, 2003
 
1.
a person who resides in Iraq and likes to throw rocks at vehicles, and other moving objects
This rocklobber is denting up my tank
by Keith November 27, 2003