nod the nut
obsolete To admit to being guilty of some crime or offense in a court. From the image of one's head (i.e., one's "nut") being bowed in recognition of one's guilt. Primarily heard in Australia. Nodding the nut is the only way you'll escape a death sentence.
nod the nut
plead guilty to a charge in court. Australian informal In colloquial terms, nut is the head, which is nodded to acknowledge guilt.