I found the following in the Urban Dictionary, my "go to" for unfamiliar terms:
A pocket list is a list which you keep all the good places that are worth visiting, like bars, restaurants or spots for nice views, etc. The reason why it's called a pocket list is you keep it in the pocket, so you can ‘write it down’ whenever any good idea/venue comes up.A pocket list could be a note on your phone or just stored in your mind.
A: Let's have a night out!B: Definitely!! What is in your mind?A: Do you have any pocket list?B: Yessss, how about <the bar name>?A: Sweet. I'll meet you there!