cuff
off the cuff without preparation. informal
☞ This expression refers to impromptu notes made on a speaker's shirt cuffs as an aid to memory.
on the cuff
1 on credit. US informal
2 beyond what is appropriate or conventional. New Zealand
❶ 1992 Sandra BirdsellThe Chrome Suite Their surveillance system keeps a beady eye open and they don't let you buy groceries on the cuff.