Top definition
When a conspiracy hyped, ALL CAPS typing person posts an unrelated article on a thread with intent to garner interest to his/her cause.
Person A: "I love this meme." *Posts picture meme about grumpy cat being grumpy to life*

Conspiracy Derp: "DON'T SAY YOU WEREN'T WARNED!!! RED ALERT: EMERGENCY ALERT: Soldiers warn of coming gun confiscation and war against patriots." *Posts link to video*

Person A privately messages friend: "Dude, I just became a victim of a recent derpjacking." *Posts screenshot*
by CRLGer December 30, 2013
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