I happen to came across the phrase "Fill your boots man!" last month when my Girlfriend shared an audio recording of a prank call to me. Becky, an 8 year old girl from Dublin, asked a demolition company to destroy her school because her teacher gave her lots of homework during Fridays. The conversation was very hilarious, and as Becky about to end the call she told the demolition man "Fill your boots man!" Thats all for Becky, you can check this video in youtube if you want.
Now, FYI, in UK the phrase "fill your boots" means help oneself. There are other phrases that are same sound of the above phrase. But as how Becky used it I think she was telling the man to help himself fulfill the task she was asking him, to demolish her school.
