This saying of the graceless Gibbie means literally, "Devil take the hungriest."
Gie a bairn his will, and a whelp its fill, and nane o' them will e'er do weel.
Gie a beggar a bed, and he'll pay you wi' a louse.
Gie a carl your finger, and he'll take your haill hand.
Gie a gaun man a drink, and a rising man a knock.
Gie a greedy dog a muckle bane.
Gie a thing, tak a thing, and that's the ill man's ring.
"Gie her her will, or she'll burst," quo' the man when his wife kamed his head with the three-legged stool.
Gie him a hole, and he'll find a pin.
That is, give him an opportunity, and he will take advantage of it.