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The ability to do something because you are in the shower which you would normally be prohibited from doing thanks to social standards.
Joe: "gah, I really need to blow my nose."
Joe in shower: *blows nose and does not need a tissue* "man, what a great shower power"
the rush and good feeling you get when ur gross, then you take a shower and get all clean smellin and good looking, then you got that shower power
brad: oh my gaw girl. you look good.

girl: ew, you smell gross and look grungey.

brad: damn, i'm gonna go home and take a shower power.
by cHiNcHeCk August 13, 2010
The act of masturbating in the shower.
I hear he does shower power every day.
by ShowerPowerer April 07, 2009
when someone feels the need to sing as loud as they can while in the shower
*guy* oh my god my neighbor is so annoying when they take showers.

*guy's friend* why?

*guy* they get shower power
by maddiejoy14 February 01, 2009
The ability to endure harsh weather conditions after taking a long hot shower. Esp. cold.
Mike: Damn! Where's your jacket? It's like 20 below out here!

Jim: No problems bro, I've got shower power.

Mike: Oh, I was wondering why your hair was frozen!
by CupricCow February 03, 2012
the act of hard passionate penertration within a hot shower
wana come round for some shower power
by xxRosscorexx May 04, 2004