A colloquial term on the internet meaning "mansex" or homosexual male sexual relations. It comes from the term "mansechs", which was (is) a popular way of spelling "mansex" on many internet forums and that bastion of the linguistically adept, IRC.
Him? Oh, he doesn't like women anymore. He has given in to the darkforce that is teh manches.
Name given to the baggy music 'scene' in Manchester during the late 80s-early 90s. Included bands such as Happy Mondays, The Stone Roses, The Charlatans, Northside. Occasionally some cockney twats like Flowered Up are included under this term. But they shouldn't.
I'm abig geek and I call the music I listen to Madchester!