This descriptive phrase is reminiscent of the commonly used saying, "the squeaky wheel gets the grease." There is also a scriptural rendition of the principle found in the parable of the woman and the unjust judge:
'Now, unto what shall I liken the children of Zion? I will liken them unto the parable of the woman and the unjust judge, for men ought always to pray and not to faint, which saith--
There was in a city a judge which feared not God, neither regarded man.
And there was a widow in that city, and she came unto him, saying: Avenge me of mine adversary.
And he would not for a while, but afterward he said within himself: Though I fear not God, nor regard man, yet because this widow troubleth me I will avenge her, lest by her continual coming she weary me.' (DC 101:81-4) See also Lu 18:1-8.
Mosiah granted the requests of his people because they wearied him with their teasings. The Lord will grant our requests made in humble prayer if we are persistent. But remember the old adage, "be careful for what you ask for, for you may get it."