An abbreviation for "personal". Used to explain to others your status involving outside heads on your blunt.
To "only roll pers", to have obtained enough weed to declare that you need a blunt all to yourself to be satisfied and/or have the power to do so.
"lets all throw down 2 grams for this next blizz"
"tell you what, you guys do that, ima roll a one eighth pers blunt"