Pronunciation: [ɪz ðɪ ˌʌp ˈʌp] (IPA)
Correct spelling for the English word "is the up up" is [ɪz ðɪ ˌʌp ˈʌp], [ɪz ðɪ ˌʌp ˈʌp], [ɪ_z ð_ɪ_ ˌʌ_p ˈʌ_p] (IPA phonetic alphabet).
Correct spelling for is the up up