[? cabbage n.1 (1), tailors’ scraps, thus ‘padding’; ? OF cabuse, imposture, trick; cabuser, to deceive, to cheat; also OF cabas, cheating, theft; Fr. cabasser, to pack up, to cheat, to steal; cabasseur, deceiver, thief; ‘but evidence is wanting’ (OED)]
[early 19C] deceitful talk.
[mid–late 19C] a ‘crib’ or other form of cheat used by schoolchildren.