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1.
A phrase meaning a person who has evolved beyond the limits of sexual orientation.

A person who would be happy with any kind of person. Female, Male, Android, Non-gendered alien species etc.

Originated on the BBC series Doctor Who in reference to the character of Captain Jack Harkness.
Relax he's a 'Fifty First Century Guy' he's just a little more flexible when it comes to dancing.

How flexible?

Well by his time your species has spread across half the galaxy.

Meaning?

So Many species, so little time.

~The Ninth Doctor to Rose Tyler

Hey did I see Chris go home with Shelia AND James last night?

He's a Fifty First Century Guy.
by flashwildecard June 21, 2011