noun
real talk; serious conversation
Slang term for a genuine, no-joke conversation; often used among friends to signal a shift from casual banter to a sincere topic.
ちょっとマジ話していい？
Can we have a real talk for a moment?
昨日、友達とマジ話をした。
Yesterday, I had a serious conversation with a friend.
Adjective/adverb meaning 'serious' or 'really'; マジ話 is a compound noun built from it.
Compound of slang マジ (serious, real) and 話 (talk, story). The exact origin of マジ is uncertain, but it likely derives from 真面目 (まじめ, serious).