Top Definition
Once a particular a member of an online chat, Skype call, etc. begins acting derpy, the likeliness that the conversation will become more derpy and off topic increases.
"Man I just got out of a really long Skype call."

"Really? What was it about?"

"Well it started off being really philosophical, but then it ended up being about Batman."

"Yeah, that would be the Barnold effect."
by Sprite1701 February 17, 2014

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