"Burn My Calories", as an online buzzword, originated from a lyric in the song Calories sung by Rocket Girl 10 1, which is an episode of the movie The Richest Man in Xihong City.
Calories are physical energy units, which are widely used in nutrition measurement and fitness manuals. This word is transliterated from English calorie, and it is defined as the heat required to raise 1 gram of water at 1 atmospheric pressure.