adjective, jam·mi·er, jam·mi·est. British Informal.
Examples from the Web for jammy
I can't put it down, all jammy, on the clean napkin on the tray.The Flaming Sword in Serbia and Elsewhere|Mabel Annie Boulton Stobart
It ain't quite our up-to-date kibosh, o' course, but the way as that Sam chewed the rag was just jammy.
Many thanks, my pretties, many thanks for thus embracing me with this jammy accolade.
He was succeeded by his eldest son James, afterwards known as Jammy Lowther.The Vale of Lyvennet|John Salkeld Bland