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

[M A V I C]

space-time wrote:
[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