This is your periodic reminder that the word “derp” and it’s derivatives is ableist. It’s meant to connote people who have difficulty speaking or speaking clearly due to intellectual, cognitive or physical issues including autism, retardation, and cerebral palsy. A quick glance at the photos associated with various “derp” memes makes this crystal clear.

When you call something “derpy” that’s what you’re saying. If you wouldn’t use other ableist words like retarded or stupid (which you wouldn’t because you don’t use ableist language) then you’ll also remove this ugly slur from your vocabulary.