to drink, party, and in general rage during the day. This is a more dedicated form of day drinking. Day rages usually end in the evening with the rager passing out, throwing up, or being lost in their incoherent state. This, however, does not happen to people who drink like a boss. These people turn their day rage into a classic rage and generally continue drinking into the night.
"Dude, exams just ended, what do you want to do tomorrow"
"We're all going to Kenny's place to day rage, we got enough booze to go all night and an oz to smoke up"