1)You back out of a night to be with the boyz to be with your girl & they reply: "Man... Julie got you open".
2)Back in the day the phrase was "Got your nose wide open."
3)It is also used in rap to describe a lyric, song, rhyme,etc that is dope.
"Dat new
DangerDoom CD got me open...I (
rock'd)
track 7 all day at the (crib).