Used when you don't care about something, or have no opinion on a matter.
Sometimes used without the 'i', ie "I dgaf about her".
Person 2: idgaf
To be IDGAF is to have high energy that's legit, charismatic and ultimately, positive in every way. In no way is it negative, as long as it is used with moderation and consideration of the environment. (for example being sexually assertive idgaf on a first date may not be the best idea, unless you know she's into it ;)
IDGAF-ery is a common trait among ballers, musicians, pimps, sensual lovers, dancers and MLBCs.
John: "hey man, IDGAF!!! No worries."