Goddammit, Rudolf!
Even in horse form you still throw down near-impossible-to-translate puns in your chewing SFX!
CHEWING ONOMATOPOEIA! WITH PUNS! OH YE HORSE GODS!
[NNescio's mood is dropping...]

Edit: For reference, the Japanese SFX for crunching noises is *bori bori*. This is modified in the last panel to *symbori symbori*.