What is Derp?

Sep 25, 2018
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I saw a “Derp Achievement Unlocked” icon appear on my desktop Windows 7 while i was messing with my background, then dissapeared once i put my mouse over it. Never seen or heard of this before. Was i hacked?
 
Sep 25, 2018
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stupid me. I did. I dug into my files and saw I had a screenshot or something and it had that on it. think that was it. think it came on when I was messing with my background and it disappeared before I could get to it. that's how paranoid I am.