You can say haffa or haff and they both mean to "hit on someone" or "to pick someone up". Or you could declare to your friends as you are about to go out, Ikväll ska vi haffa sönder!, meaning something like, "Tonight we’re gonna pick up the whole town", with sönder meaning "until it breaks", which here is taken to mean "a whole lot". Whether you are going to a haffla to haffa some guzz or not, you can always make use of haffa when asking anyone to grab you virtually anything.