A pederast stache refers to creepy moustaches often worn by pederasts. Now, it is important to make a
distinction here: Pederasty refers to actual, physical relations of a sexual nature between a grown man and an adolescent boy.
Pedophilia simply refers to love of adolescent children. Getting a mental picture? Good.
While somebody may have a pederast (super fucking creepy) stache, that doesn't
necessarily mean they are a pederast, but the chances of them being a pederast may be a little higher.