Green’s Dictionary of Slang

(US campus) to eat voraciously.

1986		Eble Campus Sl. Mar. 6: hone out – eat a lot of food very quickly.
1996		Eble Sl. and Sociability 31: Sometimes the word + particle construction is typical of and strengthens the synonymy of a group of related verbs: [...] hone out, mow on, munch out [...] all mean ‘to eat, usually quickly or in great quantity’.