a retarded person.
taken form the 80's/90's public service announcement willing us to preserve america's mentally and/or physically handicapped (there was a handicapped person standing in a feild of garbage saying "i sort glass, its my job, i was bad at first but now im good at it... dont throw me away.")

can also be used as an insult, tho will generally confuse those who hear it.

A casual invitation / threat used by an individual that is not afraid of fucking someone up.