The phrase Larry the Cable Guy uses in his stand up to try to appear funny. 99% of the time no one laughs and he should be boo'd off the stage 100% of the time.
Also used by those that try to act "redneck" which consequently only makes the individual look like a douche bag.
Billy: Hey Joe lets go swimming.
Joe: Git er done.
Billy: On second thought, get a away from me. Dont ever talk to me again; you make my IQ drop just by looking at you. Fag