The spelling of the word "haddest sexual intercourse" may seem difficult or confusing, but it can be broken down using the International Phonetic Alphabet (IPA). The first syllable, "had," is pronounced with a short "a" sound, like in the word "bad." The second syllable, "dest," is pronounced with a slightly longer "e" sound, like in the word "best." When said quickly together, the word sounds like "had-est" with the stress on the first syllable. This archaic term simply means to have had sexual intercourse.