Chalk it down
Heard in Limerick, Cork and Waterford
You had better believe it. An emphatic expression of agreement or certainty.
Beor: "Excuse me man, ju want ta go out for a meal tonight?" Feen: "Yaa chalk it down baby." Ross: "Munster are gonna win the Heineken Cup this year again." Moyna: "Chalk it down."
Pardon me sir, would you care to dine out this evening? You may rely upon it entirely.