Similar to the usage of "Burn", Boom Roasted is said after an insult or "dis"s for emphasis. Coined during the Season 5 episode of The Office titled, "Stress Relief".
"Sami, i heard you're so white you got buried in the snow on tuesday and no one noticed....
similar to boom roasted but you have to hold the "y" at the end to make the other person annoyed.
person- MMMM, what smells so good?
person 2- apperently not you
persont 2- BOOM ROASTYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY