1 - An exclamation of joy.
2 - A mocking or arrogant exclamation used to taunt a loser one has just beaten.
3 - A catchphrase picked up by stock market commentator Jim Cramer, used either as a general greeting or as a celebration of a good stock pick. "Booyah" seems to be the most prominent word used in Cramer's TV and Radio shows. When used as a greeting, often followed by "ski-dad" or "ski-daddy".
1 - Booyah! I aced my mid-term exams!
2 - Booyah! I just dunked all over your slow ass!
3a - Booyah, Jim! What is the booyah-potential for ticker symbol BHP?
3b - Booyah ski-daddy!
3c - Jim, I caught a major booyah off of EuroZinc Mining.