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1.
Used to describe a girl that is used for sex and would otherwise be regarded as useless.
She's a total smash piece.
by DGKidsLoveMe November 30, 2010
 
2.
n. a very attractive female whom you would consider having sex with.
"Yo, check it out, look at the smashpiece that just rolled in!"
by Diego Fuego January 06, 2010