Definition of munches:
(v) :
To eat vigorously or with excitement.
(v) :
(often with "on") To chew with a grinding, crunching sound, and with the mouth closed.
(n) :
(countable, colloquial) An act of eating.
(n) :
(uncountable, slang) Food.
(n) :
(countable, colloquial) A location or restaurant where good food can be expected, or an instance of eating at such a place.
(n) :
(countable, BDSM) A casual meeting for those interested in BDSM, usually at a restaurant, bar or pub.