macademia nut

A college student/graduate wif a hard tough "shell" dat is difficult to "crack" --- i.e., he is so "rigidly wrapped up" in his dusty boring books dat he cannot effectively interface wif da common man.

Faust was famously suffering from being a major macademia nut --- he'd learned a lot about a variety of literary subjects, but he didn't know da simple nuances of life, such as how to have fun or da ways of effectively communicating with people.

Macademia

An academia of macadamias.

Guy 1: I'm going to pursue a macademic career.
Guy 2: What?
Guy 1: You know, like a macademia?
Guy 2: Dude. That's not a thing