One who is quite knowledgeable about music. Every time they get engaged in an arguement about music, they win. They usually play at least one instrument and are good at it. They can read and/or improv really well. They seem (and probably do) to know the answers to just about every bit of music trivia. They also seem to have heard everything and know about all the cool bands before you and everyone else.
Person 1: "Have you heard this really cool song by this really cool band?"
Person 2: "Of course! I heard it the day after it came out!"
Person 1: "You're such a music nerd!"
Person 2: "I know! Should I start learning mandolin or bassoon next week? I can't decide..."
Person 1: "Well, you ALREADY play at least 27 instrument... But I'd go with bassoon."
When you eat vast quantities of food all at once and you feel like you're belly has grown as if you are carrying a baby. The feeling of having gained weight suddenly can also accompany a food-baby.
Person 1: "Hey Brian, have you tried some of that soup?"
Brian: "I would love too, my I already ate too much. My stomach feels massive and i feel bloated."
Person 1:"Good for you for trying all that food, but I think you have a food-baby."