A Herpderpington is an individual who enjoys photobombing people's photos by making the typical Herp Derp face (or equivalent). This can either be
done as a
joke to be funny, or done to be an asshole. Usually, Herpderpingtons act as a group, so the name comes from a play on words on a family name or last name.
It is also the official title for those who herp
derp.