About

"Damn You Len" is a tumblr meme that originated on YouTube as a comment by user purplegirlove. "Len" refers to the VOCALOID character Len Kagamine. The original comment reads:

doctor: what happend to this girl?
Nurse: she fainted for a mega nosebleed
Doctor: thats the 5 one to day whats mking them have huge nosebleeds
Nurse: it from len * thinks about len * *nosebleed *
Doctor: damn you len

Origin

The comment was reposted as a screenshot on tumblr and gained thousands of notes, spawning several derivatives such as "Damn You X" and "Bless You Len" and many image derivatives, as well as its own tumblr tag.