"Looed" is the past tense of the verb "loo," meaning to use the toilet. It is pronounced as /luːd/ with the long "oo" sound in the beginning and a regular "d" sound at the end. The double "o" in the spelling signals the lengthened pronunciation of the vowel sound. While "looed" is not a commonly used word, it follows the general pattern of adding "-ed" to the end of a regular verb to indicate past tense.