Usually a senior investment banker such as an MD who generates large sums of money by doing business with high profile clients. Synonyms include: Baller, Boss, King
Usually drives a Bentley and wears gold dollar cufflinks
Analyst 1: Yo dawg, what's your bonus?
Analyst 2: Man, I only got $60K
Analyst 1: Damn son, we bustin' out 100 hours for such a weak bonus!
Analyst 2: For real, man I heard those guys over in TMT got $90K thanks to the rainmaker
Analyst 1: Yeah dawg, Joe is such a boss.