Used other than figuratively or idiomatically: see up to, here.
Just fill the bucket with water up to here.
Overwhelmed, busy, buried or swamped.
I have been up to here in paperwork all week.
Used as an intensifier.
I have had it up to here with his sarcasm.
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.
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