The spelling of the word "gotten bottom" follows the phonetic transcription of the word. The first syllable "got-" is pronounced with a short "o" sound, as in "hot" (IPA: /gɒt/). The second syllable "-ten" is pronounced with a long "e" sound, as in "beet" (IPA: /tɛn/). The final syllable "-bottom" is pronounced with a short "o" sound, followed by a glottal stop, as in the word "bottom" (IPA: /ˈbɒtəm/). Therefore, "gotten bottom" is spelled phonetically as /ˈɡɒtən ˈbɒtəm/.