Like most countries, Ireland has its own colloquialisms, which form an important part of Irish culture. Often times these phrases, which are regularly thrown into everyday conversation, seem to make no logical sense, which can further confuse non-natives, even those whose English-speaking skills are quite advanced. As this video shows, this is more the case in a social, informal context rather than a professional one.
'What's the craic?', 'it'll be grand,' 'it's lashing,' 'go away,' and 'come here 'til I tell you,' are all phrases that are commonly used when having a relaxed chat with somebody, gossiping, or just engaging in small talk.