(n.) An alcoholic beverage had before an unpleasant task. The fact that britains' second empire and the Netherlands' first rose at the same time caused a great deal of tension between the two nations (though never real animosity like there was with France) and when they joined in temporary naval alliances they noted that dutch sailors took thier alcohol allowance just before battle, whereas the Royal Navymen drunk throughout the day.
I need some dutch courage before going down on that hairy, spotty bush!
liquor, false courage from drinking liquor(this use, like many derogatory uses of dutch, comes from a time when England was at war with Holland. However, dutch also means German, which can be confusing)
Those pussys were drinking dutch courage, thinking it will make them tougher. What a bunch of sissys!