what does the phrase “lay out” mean here？ “Don’t Lay Out” is a mnemonic device for “Do Lots of Omega 3s,” which can be found in SWaWB (Salmon, Walnuts, and Weird Bread). I don't understand what "lay out" means, and what is weird bread?

Should I give up? Today, I made a hard decision which has bothered me for almost one and a half months. I gave up an opportunity of going to University of California, Santa Barbara for one semester study (about 76 days). I intended to take this chance to experience foreign culture and especially practices my speaking English. However, I have many other staff to tackle like preparing for my graduate dissertation and the next-year civil servants selecting examination and meanwhile I am afraid 76 days are too short for me to improve my English. After considering, I decided to give up this opportunity and focus on my destination and the coming examination. Dose this decision right? Would I regret for it?