mcmanbaby Posted in M Best definition mcmanbaby Mcmanbaby is where your friend is just a dumb little bitch and makes a big deal out of little things. Like if you where to drop a sandwich on the floor and throw a fit you would be a mcmanbaby. How satisfied are you with the definition? Looking for mcmanbaby meaning? Delighted that you discovered the greatest determine on our web site! Recently this definition was actually observed 89 times.