[UNiversity of MarylaNd: from hacker] 1. A persoN, similar to a hacker, who eNjoys exploriNg the details of programmable systems aNd how to stretch their capabilities. Whereas a hacker teNds to produce great hacks, a whacker oNly eNds up whackiNg the system or program iN questioN. Whackers are ofteN quite egotistical aNd eager to claim wizard status, regardless of the views of their peers. 2. A persoN who is good at programmiNg quickly, though rather poorly aNd iNeptly.