up to your armpits

up to (one's) armpits (in something)

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!
See also: armpit, up
Farlex Dictionary of Idioms.

up to your armpits

deeply involved in a particular unpleasant situation or enterprise. chiefly US
See also: armpit, up
Farlex Partner Idioms Dictionary
See also:
  • up to (one's) armpits (in something)
  • up to (one's) elbows (in something)
  • up to (one's) eyeballs (in something)
  • up to (one's) eyes (in something)
  • up to the eyeballs
  • up to the eyeballs (in something)
  • up to the eyes (in something)
  • up to your elbows in
  • up to your eyes in
  • in control of