Green’s Dictionary of Slang

crunchy adj.1

[? the ‘crunching up’ of one’s face/body in embarrassment]
(US campus)

1. embarrassed.

[US]Da Bomb 🌐 8: Crunchy: The feeling you get when you do or say something stupid.

2. exhausted.

Online Sl. Dict. 🌐 crunchy adj 1. exhausted, not well. (‘I feel really crunchy.’).