Sidekick at a chick flick

• Bachelorette party attendee
• One joining in on a ladies' night out
• Certain platonic friend
• Arm candy, in tabloid headlines
• Female friend, tabloid-style
• Whom a guy might hang with when he's not with the guys
• Female companion, in tabloids
• Certain arm candy, in tabloids
• Rhyming friend

Wiktionary Word definitions in Wiktionary
n. (context slang English) A female friend or girlfriend.