Literally 'breaking through the ceiling'; figuratively used when prices or figures suddenly surge to very high levels (often in market/economic contexts).
株価が突然天井抜けして、投資家を驚かせた。
Stock prices suddenly shot through the ceiling, surprising investors.
人気商品の需要が急増し、販売価格が天井抜けした。
Demand for the popular product surged and its selling price skyrocketed.
ここ数ヶ月でゲーム内の課金額が天井抜けしている。
In recent months spending on in-game purchases has gone through the roof.