Why "Secure Empty Trash" appears on some SSD Macs and not others?

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M A V I C wrote:
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[quote=M A V I C]
... Clearly I spaced on this one. ...

WTF does this mean? Are you making fun of me?
It's an old saying. Short for "spaced out". http://dictionary.reference.com/browse/spaced-out
Man, you took my question seriously?