Those clever insults we find in the classics (read: Shakespeare) are usually multi-layered in meaning. Therefore, I submit to you that each insult have two components, each a barb, but the two combined a truly two-edged sword:

nerd in a pocket (a nerd under someone's control)
nerd in a pocket-protector (a nerd under another nerd's control)
Nereus, Nerd of the high seas (akin to a Greek sea-god)
Neronic, Emperor of Nerdness (Hail, Nero!)
Neurotic nerd of the Netherlands (no offense intended, of course)

Oh, I give up.