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It's when you eat one big meal in a day. Br-breakfast , un-lunch, and ner-dinner. It's a combination of the 3 meals into one.
I had a brunner at about noon.
Brunner by Amelia Earhart September 20, 2017

The Brunner 

Getting a blowjob while getting a colonoscopy
I thought it was just a polyp but I was getting the Brunner
The Brunner by Salties July 8, 2022
The combination of breakfast, lunch and dinner all consumed in one meal, because:
1. one woke up too late, or
2. one cannot afford to eat three meals.
1. I'm hungry, go get my brunner at the 24hr.drive-thru.
2. I need to dig up some change for my brunner...here try the couch.
Brunner by Ange-Tron May 13, 2003

christine brunner 

wacking two guys off while giving another head, all at the same time.
i walked into the room and she was giving a christine brunner.
A (close enough) portmanteau of the words breakfast, lunch, and dinner.
When you have woken up really fucking late and decide to eat one meal that constitutes every meal of the day, breakfast, lunch, and dinner, combined.
So I woke up really fucking late, probably gonna go down, eat some brunliner and finish studying all night.
Brunliner by M3RLYN January 11, 2021

Bruninner 

A meal that replaces, breakfast, lunch and dinner.
Damn, I was so busy at work that I only had time to eat once all day. That was quite the tasty bruninner.
Bruninner by Urban Hermit Man November 1, 2011