Was humming this song "Aaja aaja dil nichoden.." from Kaminey, when it struck me that maybe the word gullak was derived from "good luck".
Checked it, and bingo..
Checked it, and bingo..
Yahaan alag andaaz hai, jaise chhidta koi saaz hai, har kaam ko taala karte hain, ye sapne paala karte hain