A combination of DGAF and YOLO, stands for: Don't give a fuck, you only live once. Used when DGAF just isn't enough and you need to emphasize your true level of dgaf.
A hardo is a person who tries extremely hard at everything. Most times a hardo will try very hard at things that do not require excessive effort. For example, sports practices, gym class, etc.
Wow did you see Jack at practice today? What a hardo!