A master is out

From The LURKMORE Wiki

Originally the caption to a picture posted to 2chan of a dog shyly peeking out around a corner, implying in awkward grammar that the dog's master was out somewhere and thus the dog was waiting for them to return. The picture in question spawned several photoshops and the phrase was applied to several other pictures, eventually evolving on its own into phrases like "an insect is delicious" and "a photoshop is atrocious."