The new way to wish someone sweet dreams, in order to confuse the hell out of them. Once you wish someone "Sweet Roosters", you must not explain what it means, just walk away letting them think you have gone all Buffalo Bob on their ass and lost your fucking mind!
Sweet Rooster also acts as a double entendre, when used in the same context as above.
1)Right before Brie went to bed I wished her sweet roosters. . . The look on her face was priceless, and the restraining order she took out on me was too.
2) I came straight out and asked her if she wanted some of my sweet rooster?