An afternoon version of Brunch. It is a meal which combines both Lunch and Dinner. It normally occurs in between 4 and 5 in the afternoon. This situation normally forms when you forget to eat lunch but it is too early for dinner, subsequently you decide to have one massive meal to satisfy your nutritional needs for the rest of the day. You cannot have Brunch and Dunch as the lunch part would be repeated i.e. if you have brunch, then a meal at around 4-5, that meal would simply be an early dinner.
A meal in the earlyafternoon after lunchtime but before dinnertime. The idea occupies the space between lunch and dinner in the same manner as "brunch" occupies the same space between breakfast and lunch.
John: Hey, Susie. It's 4 p.m., and I'm starved. Wanna have dunch?
Susie: Sure, John!