verb - slang; to drink one or more Monster energy drink, equivalent to saying "shoot up" when referring to injecting drugs intravenously
Guy 1: Dude, I've got a ton of homework to do tonight and 3 group meetings to go to.
Guy 2: Sounds like you need to beast up if you want to make it.
Guy 1: You shouldn't beast up before your big presentation.
Guy 2: Why?
Guy 1: It will melt your mind.