Translation:

It is hard to explain my friend.

It is as if one day you'll be with your friends, browsing in JD Sports (sports shop) and you fancy a curry from the "curry club" menu at Wetherspoons (a nationwide chain of drinking establishments that serve "pub" style food).

However your friend who is male, called Callum, who is also an absolute legend and the epitome of banter (friendly and humerous conversation of a non-serious manner) will say "Brethren (an old fashioned way of referring to a friend you consider a brother) let's have a naughty Nandos (a chain restaurant that specialises in Peri Peri style chicken) instead"

Consequently you will think "Most excellent, let's go there and excel at the process of ordering and eating food"