1. Stains left in the seat undergarments. See also: "Skid Marks" and "Bacon Strip"
2. A contraction of "Script Kiddies". Script Kiddies are inexperienced young hackers that use programming scripts (Login, Visual Basic, et. al.) for malevolent ends.
1. Whoah! You scared the bejeezus out of me. Hold on. I gotta check my shorts for skiddies.
2. I can't believe a bunch of Skiddies got into my website and messed it up.
A act during intercourse, when you drag your ass across your partners chest, unaware you didn't wipe your assall the way leaving skid marks across her titties. Hence leaving skiddies.
A Skiddie or Script Kiddie is the term for an adolescent who takes a script from another website and uses it to hack without fully knowing what they are doing.
The key difference between a real hacker and a skiddie is that true hacking requires a large amount of skill, executing a script made by someone else requires little to no skill at all.
Being called a Skiddie or Script Kiddie is possibly the most offending insult a hacker can recieve.
The term Skiddie is often preceded by the word 'Dumb'.