What does baka mean?
Tell me, please
If you want to make it clear that you're using the term in a humorous/affectionate way, you can say 馬鹿ちゃん (baka-chan).
“Baka” (ばか, or 馬鹿) is used to call someone an idiot or stupid, or imply they are being foolish. It’s used often in Anime, sometimes in a sarcastic or humorous tone.
everyone is correct. it means stupid, foolish, idiot etc. but sometimes you use it as a idiom when something breaks.
For example ねじがばかになる。 means the screw has broken and getting loose.