A skins party is a huge party in someone's house where nearly everything is broke, lots of people are having sex and almost everyone is either drunk or drugged up.
A white person who's so trash that he/she shouldn't have even been born. Similar to the term "Caucasishit".
"His racist ass called me the n word over social media, but he would never call me that in person because I will knock the hell out of that Semen Skinned Waste Of Sperm."