The polish word for beer (pronounced 'pi-vo').
Polish beer is excellent compared to most of the piss-weak lager you get in England. It tastes nice and is generally a lot stronger, ranging from about 5% to 7.5% ABV.
Unlike most super-strength beers (Special Brew, Kestrel etc.) a strong piwo does not taste like it's had meths added to it. In fact, many people have made the mistake of thinking that because it tastes good you can just drink it like you would drink normal lager... with hilarious consequences!
Becky: "Here, try this piwo, its really nice"
Mark: "Oh wow that is nice, I could drink that all night"
3 hours later....
Mark "Yoor my besht mate, yoo are.... euughhhh!!!!" 5 minute vomiting fit
A corner shop or other convenience store run for, by or on behalf of Eastern European people
"Hey Alex, I'm off to the sklep, you want some tins of piwo
Person 1: "Is the sklep still selling tinnies for 80p each?"
Person 2: "Nah, it got busted by Revenue & Customs again, they're back up to £1.25"