Pinik
A word invented by the great-grandson of the famous Bengali poet Kazi Nazrul Islam, Kazi Ahnaf Islam.
It is, described by him, a word used to describe an undescribable joy.

This word is also often written as "P1NiK"
Rafsan: Bro your parents have just been in a car accident
Kazi Ahnaf Islam: Shei Pinik toh!