That is Claptrap (though me and my friends always spell it CL4P-TP), a CL4P-TP Steward Bot made by Hyperion (which must be why he hates Hyperion so much). It'd take too long to explain, but safe to say, every Borderlands player knows CL4P-TP (to be clear, that's pronounced as "Claptrap," unless it's followed by the words Steward Bot, in which case it's pronounced as "C-L-4-P-T-P").