Skill issue: Typically Players in video games or online games who are less than average. These players are typically your "Friends that are there for the fun not for the skill," sometimes you will notice with these players it is like playing Russian roulette Sometimes these players hit, other times they are utterly horrible. and more on the horrible side.
These players typically Use the excuses "Oh i lagged," "their cheating," (10games in)"I just need to warm up, and many more like it.
These players also tend to sometimes be hostile. When they are killed they are seen to: repeat players insults to them, Accuse other players of bad game play, and tend to be very loud upon dieing or being bad.
Example of how Skill issue would be used:
Preston(Player one): "I Cant even stay alive! You're so lucky im lagging."
Hayden(Player two): "Sounds like a skill issue."