Sappie

In general the dutch word "Sappie" or "Sap" refers to a 500 millilitre can of cheap beer. It's mostly used when a person uses the key to open a drinkhole at the bottom of a can, allowing air to flow into the can when opening the lid of the can, resulting in optimal drinking conditions.
More specific use of the word "Sappie" refers to the 7.9 percent ABV beer from the brand Perlenbacher: Perlenbacher strong

"I feel like pulling a Sappie"
"Oh no.. We are out of Sap"
"To Sap, or not to Sap, that is the question"
"Your mother called, go get more Sap"