The spelling of the word "haddest coition" may seem confusing at first glance, but it is actually quite simple when broken down phonetically. The word is pronounced ˈhædəst kɔɪˈʃən and is derived from Middle English. "Haddest" is the second person singular past tense form of the verb "have" and "coition" simply means sexual intercourse. So, "haddest coition" means "you had sexual intercourse". While it may not be a commonly used phrase in modern English, understanding its phonetic breakdown can help decipher its meaning.
The phrase "haddest coition" does not have a direct etymology as it is not a commonly used or recognized term in the English language. "Haddest" is the past tense of the verb "have" in the second-person singular form. "Coition" refers to sexual intercourse. However, it is essential to note that the phrase, as a whole, is not a standard or widely used expression.