lemuring

While attending large events, it describes the action of someone who joins a group conversation only to stare like a lemur while remaining awkwardly silent.

Person 1: "I've had it with this onslaught of people who can't have a normal conversation. I'm saying they enter the group, say their name, and literally stare at me while the rest of us try to converse like a bug eyed lemur didn't just sit on someone's shoulder."
Person 2: "Wow, that sound like some pretty extreme lemuring."