Dunch refers to a meal enjoyed subsequent to lunch but prior to dinner.
Dunch should be distinguished from linner, another meal occurring in the post-lunch, pre-dinner interval, in that dunch occurs after linner, closer to dinner time.
Thus, the socially accepted norm with regard to afternoon eating agendas comprises the following progression of meals:
Lunch --> Linner --> Dunch --> Dinner
A: "...I'd love to but I have to take a horrendous dunch." I'll see you at the 3:00 meeting."
Guy1: Hey Breh....hey wake up
Guy2: what..what the fuck do you want
Guy1: wheres your plunger?
Guy2: What? Why?
Guy1: I just took a hella big Dunch man its not looking to good in there.