Someone who consistently makes comments that cross the line. Someone who doesn't understandwitty banter, instead moving to insults. Typically a meathead, or someone who lacks the intelligence to burn someone in a humorous manor...
One of many forms of a peado. They can be identified by their large dark green trench coat, their huge black combat boots. They often wear a large white stetson hat with the rim just about covering their eyes. They wear a pair of tiny childrens sunglasses that are so small that they only cover the iris in their eye. They walk down the streets with their legs squatting very low and their torso leant back almost horizontally, they dangle their arms down and make a distinctive 'mmm' noise when they get close to a kiddy. They can be seen often at fences of primary schools.
Some one who is known for crossing lines consistently without caring. Can include telling people off, saying things you should not around other people, doing things to other people/other people's property.
A line-crosser can be someone who upper decks someone's toilet or putting an air horn in someones ear.