Ruby Kurosawa's (From Love Live!! Sunshine) catchphrase.
It's supposed to be a joke on words because ganbaru (roughly) means 'Do your best' in Japanese and her name is 'Ruby' so it becomes 'ganbaruby' which means 'Do your rubesty'!
Love Live fan #1: I have two tests coming up..
Love Live fan #2: Don't worry! Ganbaruby!
Japanese idiom that means "do your best" or "go for it." Often spouted to boost one's self-esteem and encourage them to succeed. Shouted primarily at sporting events and the like.
1.)Ken: That broad with the snaggle tooth wouldn't stop smiling at you last night. What was her deal?
Matt: Awe dude, she was straight gabaaage.
2. My NCAA hoop bracket is straight gabaaage.
3.) Girls that wear those mini, half-ass dungeree jackets that stop half way up their backs are straight gabaaage. Seriously, look at your fuckin' self.