from The Century Dictionary and Cyclopedia
- So ripe as to be ready to drop from the tree.
Sorry, no etymologies found.
They were, indeed, the best nathured couple in Europe; they would lend you a spade or a hook in potato time or harvest, out of pure kindness, though their own corn, that was drop-ripe, should be uncut, or their potatoes, that were a tramping every day with their own cows or those of the neighbors, should be undug -- all for fraid of being thought unneighborly.
[Some editors have pleased themselves with tracing the sentiments of this song in certain street ballads: it resembles them as much as a sour sloe resembles a drop-ripe damson.]
"Larry would keep his word, though his own corn was drop-ripe; and havin 'once undertaken the job, he couldn't give it up till he'd, finish it off dacently.