Definition
Overwhelmed, busy, buried or swamped.
Origins
All such constructions, along with elbow-deep, knee-deep, waist-deep, neckdeep, and so on, rely on the same metaphor: the depth to which a wader or swimmer is submerged in a body of water.
In Context
- "I have been up to here in paperwork all week."
- "They have their lives to live and I'm up to here in disgust with mine."