Haddest a whack is an archaic term that means to strike or hit something with force. There are many words and phrases that can be used to convey a similar idea, depending on the context. Synonyms for haddest a whack include words such as smack, thwack, lash, whap, and wallop. Other phrases that can be used to describe a forceful strike or hit include giving a good punch, delivering a hard blow, or landing a heavy hit. Whether you are describing a physical altercation or a metaphorical struggle, there are many ways to convey the idea of a powerful impact.