Thanks,glad you liked my little ditty!
That song Elizabeth,was actually After "Fresh Prince" had ended. Will Smith (under his own name) took the song to #1 in 1998. Actually 9 years ago this month.
That term though was already a hip-hop/rap phrase,which after Will's #1,became (unfortunatly) a punchline on TV comedies,most notably "Seinfeld".
The phrase really dates back & relates to something Sister Sledge sang about in 1979...
"He's(or she's)The Greatest Dancer".
Which is the music sampled in Will's song.