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4.
It happens after a very heavy night of drinking when your stomach can't handle your first breakfast and decides you should taste it all over again.
guy #1: Ya, I had a great night out until I decided bacon and eggs were the way to go.
guy #2 with excitement: Uhg! I did that once and I had a second breakfast 3 minutes later. I got it all over me.
guy #1 sheepishly: Me too. It smelled like olives and beer.
by Seismo August 03, 2007
 
1.
invented by hobbits, second breakfast is breakfast all over again
We'll just have time for second breakfast before it's time to start cooking lunch.
by Sienna March 17, 2003
 
2.
Breakfast consumed after the first breakfast which is eaten very early in the morning, or early in the day in the process of a long journey. The first breakfast is usually light in nature and consists of small portions.
When I woke up early in the morning at 7am to watch cartoons my mother hadn't made breakfast yet so I just had a little bit of cereal. When she woke up at 9:30am she made me bacon and eggs, which was my second breakfast.

When I went camping with my friends they got drunk the night before so early in the morning I just had a small breakfast before they awoke so that we could all eat breakfast together later. My first breakfast consisted solely of biscuits. While for second breakfast I ate bacon and eggs. The breakfast I ate with them was second breakfast.
by rsssss December 23, 2007
 
3.
To perform oral sex in the morning, before lunch but after breakfast
Man, when I spent the night at his house, he made me an omlette, and then later he had second breakfast if ya know what I mean
by bundleofsticks July 17, 2014