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A fake promise that means you're gonna take a nap, eat a whole pizza, and probably forget about the person who said it.
I'll be upstairs! (Later that day, he was found eating pizza with a shirt on fire.)
I'll be upstairs! (He didn’t come back for three days and left a sock in the microwave.)
I'll be upstairs! (He came back 10 minutes later and said, 'I had a business meeting with my bun.')