To The Tonsils Meaning

Example :   He was stuffed to the tonsils with cream crackers.  We had both been stuffed up to the tonsils with excellent food.  They sat there, robed up to the tonsils, and made me feel so below a juvenile delinquent.  With resentments choking him up to the tonsils.1960, P. G. Wodehouse, Jeeves in the Offing, chapter VI:  And who could say how soon, if I continued to be always at his side, Wilbert Cream would get it up his nose and start attacking me with tooth and claw? Already his manner was that of a man whom the society of Bertram Wooster had fed to the tonsils, and one more sight of the latter at his elbow might quite easily make him decide to take prompt steps through the proper channels.