Some feel that the university should act 'in loco parentis'. [=should be responsible for the students in the same way parents are responsible for their children]
The crowd went 'loco' when she walked out on the stage.
He's not just weird, he's positively 'loco'.
(..) I'm sorry, I'm not. I'm just another guy. No, Neo, that's not true. - It can't be true. - Why? This is loco. They've got Morpheus in a military-controlled building. Even if you somehow got inside, those are agents holding him. Three of them. I want Morpheus back too, but (..)1999 The Matrix