and *up to one's ears (in something); *up to one's eyeballs (in something)
having a lot of something; Fig. very much involved in something; immersed in something. (*Typically: be ~; get ~.) I can't come to the meeting. I'm up to my neck in these reports.Mary is up to her ears in her work.I am up to my eyeballs in things to do! I can't do any more!