Um. I watch AI occasionally, and I saw the "Pants on the Ground" episode. It does NOT mean "down to earth!"
The story: during AI tryouts, an older gentleman came in (60+, when the upper limit for contestants is 28) and he sang a song of his own composition. The lyrics refer to how stupid kids look when their pants are slung so low they don't even cover the person's ass.
The whole thing was a lark, and a bunch of people have made mashups of it, which you can view on YouTube by searching for "pants on the ground."
Here are some of the lyrics:
Pants on the ground
Pants on the ground
Lookin’ like a fool with you pants on the ground
Gold in your mouth
Hat turned sideways, pants hit the ground
Call yourself a cool cat looking like a fool
Walking down town with your pants on the ground
get it up!!