Pronunciation: [blˈə͡ʊ ˈʌpt] (IPA)
Correct spelling for the English word "blow upped" is [blˈə͡ʊ ˈʌpt], [blˈəʊ ˈʌpt], [b_l_ˈəʊ ˈʌ_p_t] (IPA phonetic alphabet).