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You say this when you're telling someone to go to hell but you're doing it with a fake smile and a laugh that sounds like a dying raccoon. If you don't sound like you're mocking them, they'll think you're actually agreeing, and that’s the worst kind of betrayal.
"Haha yeah man," I said, as my friend asked me to help him move his couch uphill.
"Haha yeah man," I said, even though I knew he was going to make me eat the last slice of pizza.
"Haha yeah man," I said, right before I walked out of the room and never came back.