Can you provide more context? “Wee” means “small” (it’s Scots dialect) and “catch up” can mean “get together with a friend you have not seen for a while and talk about what has been going on in each other’s life”. So, together, it may mean to have a short get together with a friend to “catch up”.

I think you mean "we" not "wee". When people say "catch up" it means to talk about what has happened in their lives since the last time they saw each other.