The equivalent Irish word is colleen.
It's not Irish; it's Scottish slang.
No, Lassie is not Irish. Lassie is a fictional character in a television series and movies, known for being a heroic and loyal Collie dog.
In English the Irish people call them "runners" but in the Irish language i am not sure.
lassie maybe?
'The Irish use "lad" and "lass" more often than the Scottish "laddie" or "lassie." Like the Sctos, however, the Irish will use these terms regardless of age.'
lush is a slang word for alcohol, and lushing means drinking.
It is a slang word in Ireland for a party, usually with traditional Irish music and dancing.
In Ireland it's: acting the prick / thran
good day laddie! or lassie.
lassie is not an Irish term or used in Ireland, it's Scottish. The male equivalent is laddie. The Irish equivalents are young wan (femaile) and young fella (male).
The typically UK slang is gobsmacked (shocked or dumbfounded), from the 1960s era military slang, itself from the Irish word "gob" for mouth.