On accident
I kind of can’t take people seriously when they say On accident, I don’t know or care if its more or less grammatical, it sounds like a child sputtering in my mind. It should be By accident or accidentally
Tummy
Any adult has zero business saying this lol
Historically, double-negatives were considered proper or required in some dialects of English (or what would become English depending upon where one might draw that line). Many other languages require some form of negative agreement in negative sentences.