>>26710163It's a retarded meme morons came up with to replace newfag during the summer months. It implies that you're new to the board and can only post because you're an underage who's finally out of school.
This poster ignores the fact that most schools aren't out yet for week or two, and that 4chan's traffic stays the exact same during the summer months--there are, ostensibly, no such thing as summerfags