It's literally "I know, right?" but written with an accent by a british girl. Not used in its original way, as an agreement, but rather as an "I know I'm right" way.
"Wot's twoy plos twoy?"
"It's four, innit miss? Ano roigh."
Used to make it clear that its the end of an argument or discussion.
Usually pronounced: "Period" but slurred, or "Péwiéh".
1.
girl 1: "GIRL SHE STOLE MY MANS"
girl 2: "WHA'S HER @ RIGHT NAOW"
girl 1: "IT'S CHELISSA"
girl 2. "IMMA BEAT THAT BITCH UP PERIOD"
2.
"bitches trynna come for me, but they can't. they irrelevant, period."