まじ
I-adj
Noun
1
adjectival nouns or quasi-adjectives (keiyodoshi)noun (common) (futsuumeishi)
colloquial
abbreviation
serious;not joking;straight
See also:
真面目 (しんめんもく)
「・・・おい・・・おい、先生！」「え？・・・あ、ああ」「マジだいじょうぶ？休講にしたら？」
"...Hey...Hey, teacher!" "Eh? Oh." "Are you really OK? Shouldn't you cancel the lesson?"