Meaning of “Ma?(マ?)”
“Ma?(マ?)” means “seriously?”. This is a slang.
“Ma?(マ?)” is an abbreviation for “Mazide?(マジで?)” which means “seriously?”.
Sometimes we use it like this.
“So ma?(そマ?)”.
In this case, “So(そ)” is an abbreviation for “Sore(それ)” which means “that”.
So “So ma?(そマ?)” means “Is that serious?”
We also use “Ko ma?(こマ?)”
In this case, “Ko(こ)” is an abbreviation for “Kore(これ)” which means “this”.
So “Ko ma?(こマ?)” means “Is this serious?”
Example Conversation
A: They are dating, aren’t they?
B: Ma?
A: According to rumors.
A: あいつら付き合ってるんでしょ?
B: マ?
A: って噂で聞いた