gibberish

Gibberish refers to speech or writing that's completely nonsensical and meaningless. You might hear someone speaking gibberish if they're mumbling to themselves in their sleep.

When people talk about something being "gibberish", they usually mean it was hard to understand because the words didn't make any sense together. For example, if a friend says their professor's lecture was full of gibberish, that means they thought the teacher was talking about things that don't actually go together. On the other hand, some people use "gibberish" to describe speech or writing that's so silly or playful it's hard to follow - like in children's games where adults might make up nonsense words and phrases for fun.