Just tried this with a girl I've been dating for a couple of months. We had plans for Monday, and since I work a lot and can't see her often, I thought we would definitely hang out. I texted her earlier tonight to try to confirm. She came up with some bs about how she couldn't...So I took this thread's advice and told her to "fvck off".
Her response was to officially break it off with me...
So use this "technique" sparingly and be prepared to walk away, that's for sure. Though, when a previously dependable starts flaking that's usually them telling you to "fvck off"...