Wiktionary
adv. (alternative form of until the cows come home English)
Wikipedia
Till The Cows Come Home is the second full-length album by the German heavy metal band Farmer Boys. The album has fewer songs referring to farm life or farm animals than their previous record, Countrified. Their musical direction went more to a nu metal sound unlike their debut album, Countrified. A music video for "When Pigs Fly" was made which features the band members hanging upside-down.
Usage examples of "till the cows come home".
Let's make love till the cows come home, and the chickens and the hogs and the goats and the birds.
Keep cheerful, you better ask for a bit of leave and straighten it up, it all comes of these chaps being in a reserved bloody occupation, shooting's too good for some, yours till the cows come home.
For that matter, you can argue till the cows come home whether Suhl is really part of Franconia or Thuringia in the first place.