sacred pumice
So I understand what the sentence means but I always struggle with being able to recall the sentence since I don't exactly understand the particles and how the word order fits together here.
술은 좀 이따가 마시고 밥부터 먹자
feel free to explain as much or as little as you want 
i'll take anything, tyty
severe flume
Since it’s talking about both alcohol and food. The 은 is acting as contrasting (let’s have alcohol a bit later in contrast to food which we will should eat first)
좀 이따가 is acting as an adverb to 마시다
So that’s why it’s in between the subject and the verb
And then connecting with 고, then 밥부터 부터 is a particle that means that the 밥 comes first and 먹자 being let’s eat
sacred pumice
ahhh tysm 