Correct spelling for the English word "haddest shakes" is [hˈadəst ʃˈe͡ɪks], [hˈadəst ʃˈeɪks], [h_ˈa_d_ə_s_t ʃ_ˈeɪ_k_s] (IPA phonetic alphabet).
The phrase haddest shakes is not a commonly used phrase or word in contemporary English. However, haddest is the second person singular past tense of the verb to have in Middle English. The word shakes refers to a rapid trembling or shaking movement. Without a specific context, it is difficult to determine the exact etymology or origin of the specific phrase haddest shakes.