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1.
Thighs that are supremely powerful, that are sculpted by angels. You can usually tell through somebodies trousers that they have power thighs.
Adam: Hey alex see that guy over there, he totally has power thighs.
Alex: nahh, they are nothing compared to mine.
by HatinonHorseface March 11, 2012
 
2.
When a guy,has very strong thighs, which makes them powerful. Hence Power thighs.
Girl 1:Wow that guy over there has Power Thighs.

Guy: I wish I had thighs like that.
by HatinonHorseface February 19, 2012