Correct spelling for the English word "Upsodown" is [ˈʌpsədˌa͡ʊn], [ˈʌpsədˌaʊn], [ˈʌ_p_s_ə_d_ˌaʊ_n] (IPA phonetic alphabet).
There isn't any specific word "Upsodown" in the English language. It appears to be a word combination of "upside down" presented in a playful or creative manner. The term "upside down" has a clear etymology, though. Its origin is derived from Middle English and dates back to the 13th century. "Upside" refers to the direction that is opposite to the normal or expected one, while "down" simply means a lower position or direction. Together, "upside down" refers to the inversion or reversal of the usual orientation or order.