OPU

I love chatting with Julia on the phone.  Random stuff.  Important stuff. 

Tonight I was on-line trying to help her locate potential housing for Fall/Winter semesters at BYU.  The table headings had abbreviations ...  Bdr = bedroom, DEP = Deposit,  SS = Shared spaces available, PS = Private spaces available ...

"OPU, what's that?" I ask Julia.

John pipes in, "That's what you say when someone farts."

I laughed so hard I could have farted. 

OPU. 
Occupants per unit.