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There are four main categories of when one would say, "roast on you."
1) they are flirting or be flirted with
2) somebody just told them off, they got burned, or they just said something stupid
3) they burned some one else
4) something amazing or extremely hilarious just happened
Girl: I really love you!
Guy: Your best friend told me that too.

Me: Roast on you!
by youknowwwhoitis December 08, 2014
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