the word craic has many, many meanings. it can be a description of a night out that was brilliant e.g. last night was great craic. Or if you say 'we were having the craic with those girls' means that we were having a laugh and banter with those girls. one can also say 'how was the craic?' to enquire 'was it good' to which one answers 'the craic was 90' if it was good or 'it was no craic' if it was not enjoyable
How's the craic?
She's some craic. (meaning 'she is lots of fun')
the craic is 90.
we had the craic with those women.