A very dirty, foul, or extremely unappealing place. You definitely live in the armpit of the world—all you can see from your apartment are oil tankers and smoke stacks! I'm sorry, but if the roach problem at his apartment is that bad, he's living in the armpit of the world.

A very dirty, foul, or extremely unappealing place. You definitely live in the armpit of the universe—all you can see from your apartment are oil tankers and smoke stacks! I'm sorry, but if the roach problem at his apartment is that bad, he's living in the armpit of the universe.

To be a very dirty, foul, or extremely unappealing place. Come on, this place is the armpit of the world—all you can see from your apartment are oil tankers and smoke stacks!

A very foul, unpleasant, or unappealing part of some region. People like to joke that our state is the armpit of America, but I've never understood the dislike for it. Despite housing the cradle of modern democracy, Athens really felt like the armpit of Greece compared to the country's beautiful islands and countryside.

Extremely busy (with something); deeply or overly involved (in something); possessing, filled up with, or overwhelmed by an excessive amount (of something). There's no way I can take a vacation right now, I'm up to my armpits in work at the moment! I only meant to be peripherally involved in David's business venture, but, before I knew it, I was in up to my armpits! Dana was worried she wouldn't find any work as an accountant working for herself, but she's up to her armpits in clients!