The original song is called "The 12 DAYS of Christmas."

DAY rhymes with NEIGH and appears to be a play on words.

NEIGH is the sound that a horse makes. From the dictionary:

Neigh: "a characteristic high whinnying sound made by a horse"

The original song states:
On the first day of Christmas, my true love sent to me: A partridge in a pear tree.

In your song, the "horse" theme continues with the gift being a "pony" in a pear tree.

So, the whole thing obviously has to do with horses and appears to be a parody of the following song:

https://en.wikipedia.org/wiki/The_Twelve_Days_of_Christmas_(...


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Note added at 1 hr (2018-11-06 07:10:18 GMT)
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Sorry, I didn't realize that this was a translation question (I thought it was an English-only inquiry). But in any case, NEIGH is the sound a horse makes. Not sure how you would translate that to Arabic. :)

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Note added at 1 hr (2018-11-06 07:11:15 GMT)
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A "pony," of course, is a small horse.