The spelling of "haddest rights" may seem confusing at first glance, but it can be explained through phonetic transcription. The word "haddest" is pronounced as /ˈhædɪst/, with the stress on the first syllable. This is the second person singular past tense form of the verb "have". Meanwhile, "rights" is pronounced as /raɪts/, with the stress on the second syllable. It refers to legal or moral entitlements. Thus, "haddest rights" means that in the past, you had certain entitlements under the law or other societal norms.
The word "haddest rights" does not have a specific etymology because it is not a common phrase or term. The word "haddest" is the second person singular past tense of the verb "have" in Early Modern English. "Rights" typically means entitlements or legal protections. However, the exact meaning and origin of the phrase "haddest rights" would depend on its specific context or usage.