In there deep

Used to describe a situation where there is a large group of specific people in one place. For example if there happened to be a lot of a certain demographic at one grocery store.

Situation: there’s a huge sale on diapers going on at Walmart and the baby section is full of parents.

You might say: “they in there deep” or “y’all in there deep” or “you should’ve seen the baby section at Walmart last night! The parents were in their deep!”