To allow oneself to spend a lot of money

A proclamation of confidence...that a conquest or 'win' is imminent regardless of the trails that may be faced along the way.

A provocation to opposing forces - 'do your worst...it doesn't matter...I'll reign supreme anyway'.

'Bring it'.

Is exclaimed when a favourable event occurs, be it the success in an endevour or a humourous observation.

Used to exclaim any matter of emotions, examples of use mostly evolve from the film 'Along came Polly', following the scene where Sandy Lyle shoots some hoops and verbally expresses all of his conclusive emotions in a variety of phrases including "Let it rain", "rain dance" and "white chocolate". The phrase is also often used by females from Spalding High School in many situations, and has a high comedy value.

A hand movement sometimes accompanies the phrase; this could be described as a mid-air spanking.

when a person absolutely rips someone at a sport (usually being basketball !) and score a "basket/point/goal/try/touchdown"

Let it rain is from the film along came polly when they are playing B-
ball meaning good luck

Phrase used in servers against rain