Mine has a few that I can think of but I’m definitely forgetting some:

• Snig: a secret stash. Usually of cash but it could be chocolate or whatever. Pretty sure this one is unique but I’d love to hear otherwise.
• Sero: (seero) seriously. This one isn’t unique.
• James floody (flew-dy) ah-doody amen: Weird chant in the hope that something comes true.
• edit: pinchies: little bit of food before it’s ready. Usually meat but as I’m cooking pancakes I just gave some pinchies and it reminded me of this thread