live under a rock

live under a rock

To be oblivious to or ignorant of something that is very widely known, often related to pop culture. You've never heard of Lady Gaga? What, have you been living under a rock? Well, that's all news to me! I swear I don't live under a rock.

See also: live, rock

Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.