The correct spelling of the phrase "burning ups" is actually "burning up". This phrase is pronounced as /ˈbɜːnɪŋ ʌp/ in IPA phonetic transcription. The "s" at the end of "burning" is not needed as "up" is already functioning as a single adverb in this phrase. "Burning up" means to feel very hot, to experience a high fever, or to be on fire. It's important to use accurate spellings in order to avoid confusion and to convey precise meaning in writing.