Deuteronomy 12:20

When the Lord your God will have enlarged your border, as He hath said unto you; and thou sayest, I would eat flesh, because thy soul may desire to eat flesh, thou mayest eat flesh according to all thy desire.

because your appetite desires to eat meat i.e., if your appetite desires to eat meat. This law has already been mentioned [: 15], but Scripture repeats it here to add the passage when the place will be too far. This includes any place outside of the land of Canaan: its status is the same as that of any place within your gates.

WHEN THE ETERNAL THY G-D SHALL ENLARGE THY BORDER. The meaning of this “enlargement” is not like that which he stated, And if the Eternal thy G-d enlarge thy border [by giving you the land of the Kenites, Kenizzites, and Kadmonites] etc. then shalt thou add three cities more for thee,, Verse 9. for if it were, then meat of desire [meaning a meat meal prepared solely to satisfy the appetite rather than as a product of a peace-offering] would not have been permissible upon coming into the Land [but only after the enlargement of the border, an event that has yet to take place]. But there it is said, When the Eternal thy G-d shall cut off the nations, whose land the Eternal thy G-d giveth thee,, Verse 1. these being the seven nations that he mentions in all places, and then we are to separate three cities [as cities of refuge], and so Joshua did. Afterwards he said, when the Eternal thy G-d enlarge thy border, as He hath sworn unto thy fathers, this being a reference to the ten nations that were given to Abraham. But here he said, as He hath promised thee, meaning these [seven] nations whose land the Eternal your G-d gives you [now], thus indicating that immediately after they captured and apportioned the Land, a secular meal of meat became permitted to them.
Now, the purport of the expression If the place which the Eternal thy G-d shall choose to put His Name there be too far from thee is not that meat of desire [i.e., meat from an animal that has been slaughtered for food rather than as an offering] is permissible only at a distance from the Sanctuary, for if so, dwellers in Jerusalem would have been forbidden to eat meat of desire. Instead he [Moses] speaks to all Israel, saying to them that “when G-d will enlarge your border and not all of you will be dwelling around the Tabernacle as you are today in the wilderness, unconsecrated meat will be permitted, because it will be impossible for all of you to go from a distant place to the place that G-d will choose and slaughter sacrifices of peace-offerings as much as you wish to eat.”

כי ירחיב, and as a result you find yourself physically a great distance from the Temple.

(1) AND YOU SAY, "I SHALL EAT SOME MEAT." Without my having the burden of bringing it up to the Temple.

(2) FOR YOU HAVE THE URGE TO EAT MEAT. Also when you wish to eat that portion that is given to the priests from the sacrifice.

(3) YOU MAY EAT MEAT WHENEVER YOU WISH. But not the prohibited fat or blood even though they are non-sacrificial animals.