Chugger is a combination of the words charity and mugger. A charity mugger is a generally a student or young adult (paid) volunteer who aggressively asks you to fill in a questionnaire for their particular cause be it Concern, Greenpeace, Baby Seal Clubbers. Generally chuggers don't take no for an answer so it is better to never make eye contact with them and tell them to feck off if they even open their mouths. In the movie Airplane you can see an example of how to deal with chuggers effectively.
Limerick term for Tipperary. Based on the traditional Tipperary practice of bringing the hang sangwiches with them along with a flask of cabbage water or tae to the GAA matches for fear of having to actually pay for something. In reality this practice is shared by certain residents of all counties.