What is Farnsworth?
1.
A form of sarcastic agreement with someone where you contradict them using the following format: "If by {something} you mean {something opposite} then yes." (Named after the character Professor Farnsworth on Futurama.)
Bob: That is awesome!
Jim: If by "awesome" you mean "it sucks" then yes.
Fred: FARNSWORTH'D!
See
2.
generally useless. not good for much. mediocre.
That used car is farnsworth compared to my new supra turbo.