Is the 'big egg' the egg-shaped sign in the middle that you referred to? So, are the three bits of text saying that the shops sells 'stuff' and that it is 'nonsense' to say what the text 'in the big egg' suggests, that the stuff is 'never knowingly any good'?
Alternatively, it is the product of a warped mind, and makes no sense whatsoever!
MBIFO the best bakery in Bourdeaux (not Bordeaux). They even sell the baguettes by weight, and mine came to 1.02€... and as I had either a 1€ or 2€ coin, she took the 2€ and gave me 98 cents change. Still it did make a fantastic lunch, filled with Cantal entre deux Mers cheese and local tomatoes.