npo stands for "nothingpersonalonline"
it's pop punk band all time low's website that allows their fans to talk major shit about their music and eachother. the site has a closenit group of regulars, the "npo hoes".
"dude! OHMYGOD! alex gaskarth so totally got on npo last night! he talked to me!"
"nahh, dude, it was a fake alex. his username had a space in it"