On the sunny side of. In his teens, he is younger than …, for example, he is still an optimist at forty. [/the second half of kloc-0/800]
3. sunny side up. When frying, the yolk remains intact and on the top. For example, I ordered sunny-side up eggs and you brought me scrambled eggs. This expression transforms the appearance of the sun into the appearance of the yolk. [c. 1900]
The answer is from answers.com, see the link in the Resources column.