Smackwad
Akin to Smacktard slightly less offensive however. One can often call their friends a smackwad without being punched in the nuts on account of it not implying they are a retard... just a jerk. While -wad can be applied to a multitude of derogatory terms to imply the person is not just a 'jerk' for instance but a WAD of it (emphasis), smackwad is one of those words you can use is everyday conversation without really offending anybody enough to suffer repercussions.
A fool, a jerk
A fool, a jerk
A: "I just swore infront of our head of year and she flipped on me..."
C: "Smackwad..."
C: "Aah! You spilled crap on me. Jesus, when will you stop being a smackwad?!"
C: "Smackwad..."
C: "Aah! You spilled crap on me. Jesus, when will you stop being a smackwad?!"