A joke name for porn involving one or more mechanical robots; mostly Transformers or Gundams. It derived from an Optimus/Megatron comic that, during the sex scene, made the sound effects "CLANG CLANG CLANG" and has been an internet meme on /m/ ever since.
/m/an #1: Can I have your CLANG CLANG CLANG folder? Especially the stuff with Dolores and Guncannon-tan."
by Ryoga-chan April 10, 2009
Otherwise known as the gay test. Go up to a boy and say "Clang clang clang!" If he answers with "Went the trolley!" and a big smile, then yeah...he's probably gay.
Lauren wanted to prove that just because Jimmy was bisexual, he was still interested in her. Unfortunately, the clang clang clang came up positive.
by Jhesy May 31, 2006