An interjection used when something bad happens.
Also a noun meaning a bad event
The polar opposite of "Booyah"
Dude, my girlfriend dumped me last night, major yahboo.
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1. He is the patron saint of vagabonds. He appears at concerts, equipped with tubes of glue, paper bags, and Dollar Store makeup, in order to comfort those in distress.
2. A word salad title given to someone when you cannot recall their real name.
Girl: Who is this Yahboo Boostea I keep hearing about?
Boy: He is you, you are him. Praise Yahboo.