JOJO LOPPA is  not namaste in Newaari. It is recently made by some so called Nepal bhasha bidwaan. You  will not find this word in any Newari books and dictionaries except of recent couple of years. If you analyse this word, you will find unpleasant meaning.

Loppa= loppaa khuwaaunu or just to humiliate other

jo jo= jodera

 the pseudo intellectual try to make the word which sense like "dui haat jodnu" but he /she never analysed other side of the coin.