to seize every opportunity for personal gain, typically by skimming off the top or taking a cut of whatever passes through one's hands (literally: to grab feathers from a flying goose)

这个贪官雁过拔毛，凡是经手的工程项目都要捞点好处。

acting in a highly practical, resourceful, or thorough manner to ensure no potential advantage or resource is wasted

他这种雁过拔毛的务实风格，确保了每一分预算都发挥了最大的作用。