What is "up to our necks"

adj. deeply involved; "neck-deep in work"; "up to their necks in debt" [syn: neck-deep, up to my neck, up to your neck, up to her neck, up to his neck, up to their necks]

Up to our Necks is an unauthorized documentary film on the American metal band Slipknot. This unrated biography shows never-before-seen interviews with the band members, but does not have live footage nor music by the band.