Roosters meaning : A male domestic chicken (Gallus gallus domesticus) or other gallinaceous bird. A bird or bat which roosts or is roosting. An informer. A violent or disorderly person. A powerful, prideful, or pompous person. (originally United States slang) A man. A wild violet, when used in a children's game based on cockfighting. Legislation solely devised to benefit the legislators proposing it.