The 33-year-old Trinidadian world cupper fired home the north easterners' first and fourth goals, once in either half, while Penn Orji and Zodingliana Ralte scored once each in regular time.
To add insult to injury, Brazilian Ulliams Souza Silva and Milan Singh came off the substitutes bench in the second half to fire home a goal each in added on time to complete Mumbai FC's total humiliation.
The last two goals were notched in the 2nd and 3rd minutes of added on time.
The humiliating defeat left Mumbai FC - who dearly missed their Japanese midfielder Taisuke Matsugane who could not play because of a calf injury - in seventh spot on the table with 12 points, a rung above Lajong which moved up from the 10th spot to 8th following their spectacular display here.
This was the first defeat of the season at home, and fifth overall from 11 games, for Mumbai FC after two victories and three draws. This is also the home team's second successive defeat.
For the visitors, the win was only their third win from ten matches.