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A reference to Swagatron 3000, bionic dong can be used to describe people who say things which are inane or of little intelligence. Bionic dong is quite versatile in meaning and usage.
A: DurbanpoisonXskunk said that you're a junkie.
B: A junkie? I don't even use drugs!
A: I guess I shouldn't listen to that bionic dong.

"Bionic Dong" can be used differently when combined with other phrases:
A: Jimmy and Joe are having a party tonight.
B: That'll be a bionic sausage fest.
by Hitmancool December 13, 2011