To be a complete idiot or retard. It is a funnier way to say douche or douche bag.

(see dunch-bag or dunchery)
bob- hey whats up guys wanna hang out?

hank- hell no your to much of a dunch.

peter- yeah go be a dunch-bag some where else.
by Kitten Biscuits November 25, 2009
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it is the between lunch and dinner meal. Just like "brunch" is typically the between breakfast and lunch meal.
Let's go out for some dunch.

Is it time for dunch yet?
by Carmen Di~~~ August 4, 2005
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A term not commonly used meaning shit or the act of taking a shit
Ryan -" Tom what were you doing in there for so long?"

Tom- " Dude i had to take the biggest Dunch."
by airgroves23 October 8, 2009
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When one is acting like a douche, but a bit over the top and a bit of asshole added in. (i.e. Stop cheating at spoons, you dunch-bag!)
by Cavid Brattlesbottom March 8, 2008
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The meal consumed between lunch and dinner.
Karen slept in one lazy Sunday afternoon and when she woke up she was quite hungry; having the munchies, she sat down for dunch around 3:00pm.
by Francois Hauer January 6, 2006
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when a girl is giving head, and the guy vomits.
oh my god they totally dunched last night, it was nasty!
by marshaaaaa77 August 18, 2011
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A cross between lunch and dinner. Most likely to be served by your annoying grandmother between the hours of 3-5 o' clock pm. It is just like lbrunch but later in the day and with dinner foods. You can spot a dunch server by the excessive yelping.
Wow, we had breakfast at 2 today. That probably means we're going to have dunch today.
by Naomi aka Lil Cuz July 23, 2009
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