The conversation of most men turns more or less on their own business.
Caff and draff is gude eneuch for aivers.
Chaff and draff, i.e., brewers' grains, are good enough for horses. Common food suits common people.
Can do is easily carried.
"At this moment the door opened, and the voice of the officious Andrew was heard,—'A'm bringin' in the caunles—ye can light them gin ye like—can do is easily carried about wi' ane.'"—Rob Roy.
Ca'ing names breaks nae banes.
"Sticks and stanes 'll break my banes,
But names will never hurt me."
—Schoolboy Rhyme.
Ca' me what ye like, but dinna ca' me ower.