dizzelfit
When you walk into a clothing store change room with a dress two sizes too small for your ass, believing you will fit it, but knowing in your heart you won't and as that size 6 zipper bulges over your curves, you yank on it hard, muttering under your breath "Dizzelfit", as in "This will fit" because there ain't no way you're going to that party in a size 10 dress.
Person 1: "Can I try this on?"
Store assistant: "Do you need help with sizes?"
Person 1: "Nah, dizzelfit."
Store assistant: "Do you need help with sizes?"
Person 1: "Nah, dizzelfit."