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The Rainmaker 

A sexual-act made popular in underground fetish clubs in Europe. It involves a female getting menstruation blood onto an umbrella. The umbrella is then opened and twirled at a rapid rate; causing the menstrual blood to fly off. Some western versions of this act involve the umbrella being inserted inside the menstruating female but many of the rainmakers founders frown upon this addition.
The Rainmaker by Balrog 1 June 10, 2009

Academic rainmaker 

A member of a University or other academic institution who brings in significant amount of external funding.
Most of the research funding goes to academic rainmakers like Prof. Smith.
Academic rainmaker by proffunguy January 21, 2020

_raincake_ 

_raincake_ is a very chaotic gamer/tiktoker that really likes Minecraft and music
"oh I saw a really cool tiktoker who liked Minecraft and music!" "Must be _raincake_!"
A witty person.

"He was a dam raynmaker."
Oh wow, my friend is a raynmaker when it comes to chicks
raynmaker by b1_returns September 22, 2008

The Reignmaker 

Nickname given to Will at UCONN for his ability to make it rain in the cups of his rival beer pong players, as well as forming dynasties (hence 'reign') on the pong tables.
"Oh shit! The Reignmaker has arrived, everyone cover your drinking cups!"
The Reignmaker by sinkNdrinkYOmom October 18, 2008