(BIG) [adjective], [exclamation] [informal] - very good or very bigThese are the mega issues/trends of the moment.The airline was described as a mega carrier."Did you enjoy the concert?" "Yeah, it was mega!""Shall we go out for pizza tonight?" "Yeah, mega!"
MEGA
Meaning of MEGA in English
Cambridge English vocab. Кембриджский английский словарь. 2012