On misheard lyrics

I was listening to a bit of Dizzee Rascal on Pandora the other day, and I caught his track "Bubbles".

What I heard was
"...got my brand new grimesman, dressed to suppress"

As I'm sure you're aware, Dizzee is a grime artist. I figured the genre had repossessed the upper class British suffix, and were calling their posses "grimesmen", who would then be dressed to suppress.

I was rather dissapointed when I found the actual lyrics:

"...got my brand new garms on, dress to impress"

Why must things be cooler in my mind than in reality?