When you transition to the next highest educational institution (elementary school to middle school, middle school to high school, high school to college) and you need to adjust to your teachers expecting more from you and more work and you're shocked by your grades because they're terrible/not what you expected. Normally "awe shit" follows the shock, thus the "shock and awe"
Aja: Yes! I got straight A's! What'd you get Marcus?
Marcus: *stares at grades, mouth wide open* awe shit
Aja: What's wrong?
Marcus: I got 3 F's! How did this happen!? I did good last year!
Aja: Sounds like you got the freshman shock and awe my friend