- "Oh, I'm sorry." "That's okay, no biggie."
biggiebig‧gie /ˈbɪɡi/ noun 
1[countable] informal something very large, important, or successful: 
I think their new CD is going to be a biggie.2no biggie American English spoken said when something is not important or when you are not upset or angry about something: ‘Oh, I’m sorry.’ ‘No biggie.’
1[countable] informal something very large, important, or successful: I think their new CD is going to be a biggie.2no biggie American English spoken said when something is not important or when you are not upset or angry about something: ‘Oh, I’m sorry.’ ‘No biggie.’