Phrase popularized by the 2nd series finale of the BBC programme Sherlock--put simply, not one's responsibility, strong suit, or "area." Can also be used in terms of personal preferences--e.g. "blue jeans really aren't my division," or in reverse to show an interest in something--e.g. "Tom Baxter's face is my division."
Mom: please put the laundry in the dryer.
Me: Not our division. (You can say "not my division," but definition wouldn't let me.)
Friend 1: College is so not my division.
Me: mmmm dinner and a movie, looks like my division.
A Souther California based Hip-Hop Group Made Up of Three Talented Young Men; Like (22, born Gabe Stevenson), Mibbs (21,born Mike Stevenson), and B-Young (20,born Bryan Young) Originally From Los Angeles, California These Three Talented Individuals are Currently Located in Palmdale This Group Has Extravagent Live Shows Full of Energy and Flawless Rhymes, Almost Always Taking You Back To The "Golden Era"
"Yo Did You See Pacific Division Last Night?! Sh*t Was Dope Kid"
"Naw I Missed It, But PAC DIVISION IS THE ILLEST!"