hit it up (with someone)
1. To develop or strike up a very good rapport (with someone), especially in a flirtatious or romantic manner. After a few drinks, I felt much more confident hitting it up with Janet at the party.
2. To spend an enjoyable time (with someone); to hang out (with someone). You all should come over and hit it up this weekend! I would love to hit it up with you later, but I've got a huge assignment due tomorrow.