Green’s Dictionary of Slang

(US campus) heavy boots with thick cleated soles that resemble a waffle iron.

1980		A. Rule Stranger Beside Me 51: [T]he mock suede coat with fur trim, the blue jeans, a white peasant blouse, waffle stomper boots, and some cheap costume jewelry.
c.2003		Press release NewBalance.com 🌐 With the Fall hiking season in full swing, Dunham Waffle Stompers have been making inroads with the media. [...] ‘Fashion enthusiasts will admire Dunham’s expanding array of colors and styles, while performance-minded consumers will appreciate the line’s trademark waffle-stomper sole.’.