Green’s Dictionary of Slang

absolutely stuffed.

1870		E. Waugh Chimney Corner 36: If I wur ram-jam full o’ sixpences, I shouldn’t feel comfortable .
1897		Outing (NY) XXX. 487/2: It’s truly a royal game, ram-jam full of pluck .
1898		J.D. Brayshaw Slum Silhouettes 36: The house was ram-jammed – there wasn’t standin’ room.