All what you have to do is to post the word which comes to your mind on reading the word posted by the person above you.
Example:-
1st Person:- Milk
2nd Person:- Sugar
3rd Person:- Bread
and so on...
I'll start first with the word
Masti
(so now the person below me can post the word which gets triggered the very instant you read masti and then the rest of us can follow :)