hobnob with (someone)
To interact with someone, typically someone who has more power, fame, or success than oneself. I can't hobnob with those ladies—they're executives at the biggest company in town!
hobnob with someone or something
to associate with someone or a group, especially with those more wealthy, famous, etc. I'm not used to hobnobbing with such luminaries. Walter is spending a lot of time hobnobbing with the very rich.