MA HEART
When someone is overcome by emotion especially in relation to the band 5 Seconds of Summer.

popularised by Luke Hemmings in ep 5 of their cocktail chats when he added the one to the song that was playing.
Song: Cause we can feel somethings broken
Luke: MA HEART
person 1: Did you watch the Old Me music video?

person 2: YESS! MA HEART