rooster beef curtain Share definition Flag The loose skin of a mans ball sac. Often looks like the thing on a roosters beak. Dude! Check out Mitches rooster beef curtain! That is the loosest thing I have ever seen. rooster beef curtain by Coryy September 25, 2007 0 0 Get merch Get the rooster beef curtain mug. Buy Now — $32.95 See more merch