Don't Give A Fuck Mode (DGAF) is a temporary (or permanent for some people) period of time when a person chooses to "not give a fuck" and do whatever he/she pleases without worrying about the consequences.
John: I heard Zach drank a bottle of whiskey, crashed his car, punched a cop, slept with two fat chicks, and asked his sister to marry him last night.
A fake, phoney-bologna jingle sung to the tune of the Glade Spin-Fresh air deodouriser jingle.
The phrase, "plug it up" is how one would say, "plug it in" in the UK.