A man curtain is a cape. Such as worn by super heroes and weirdos pretending to be super heroes
"Batman;s man curtain billowed in the wind as he perched atop a tall building in Gotham City."
n. 1.) The fleshy curtain(s) usually seen on the older gentlemen whose trouser have ridden slightly too high.
2.) A informal greating to a friend or associate.
3.) A term of frustration or annoyance.
4.) Can also be used in a command/ mockery.
1.) Look at Harold Bishops 'man curtains' they're immense!
2.) Easy Man Curtains, good day?
3.) (penalty miss) Arrggh Absolute Man Curtains!!!
4.) Oh mate, Get your man curtains out!