what's got into you

INFORMAL

Meaning
You can say this if someone's behaving badly or strangely.

For example
"Damn it, Mum! Just leave me alone, will you!"
"Why are you so angry, Jay? What's got into you?"

"Sorry for shouting at you, Mum. I don't know what got into me."

by MysteryEnds July 29, 2018