When an unfortunate event such as being knock down and the person who "knock you down" said sorry, you would say Dude, It's Fine.
This also can be use to piss someone off like Cool Story Bro
Dude 1: I'm sorry for running over your cat.
Dude 2: Dude, It's Fine she have 8 more lives.
Dude 1: Why the hell would you like her that I thought you were going to to put in a good word for me.
Dude 2: Dude, It's Fine.
Dude 1: No, It's not fucking fine!
The Urban Dictionary Mug
One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.
Buy the mug