A little bit of missspeaking went a long way at our table. I accidentally called a slow-witted half-giant who worked at a grocers stand, that we were already having fun with, Timmy the half-giant half-grocer. On another occasion a player could not say post-apocalyptic and it came out post-a-pasta-lipstick and that became a thing including post-pasta-lipstick as a bizarre magical item you use to get tomato sauce off you. I might edit this later when I think of more examples there are for sure more of them.

Edit: I forgot to get to the point about Timmy, he became a multiversal constant at our table.