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1.
A showerman is someone that is "big" in what he is doing, big on road or in music (as MC for example).

Originated from the grime scene and originally came from East London.

"It's showerman time", is when the big man dem is doing their thing in the shower-hour.
by Chris Zarqawi May 07, 2006
 
2.
showerman a person that likes to think they are something big when they are not.
look at that showerman walkin around buffing out his chest
by daz* April 01, 2007
 
3.
basically a waste man who is very very waste.
oh my days, that boy is showerman
by stef aka bombay bad boy May 11, 2006