What does saying one time two times mean in hiphop music?

For the most part it's a derivative of the old fashioned count-off (1-2-3-4) to get the band started on the first beat of a song all together. A rapper announcing that the down beat of his rap is coming around. Or, it can be a reaction to a musical accent or a beat drop. Just like James Brown saying "Give it to me once, give it to me twice, give it to me three times" and having the horn players accent those beats. It's creative filler, but it's possible some rapper may have used it in a different context at some point.