An aspiring rapper from Sydney's south-west has been charged with having sex with a 12-year-old girl he met through social media.

Noor Raad, who raps under the name Thundah MC, was arrested at his home in Bankstown on Tuesday after a tip-off to the State Crime Command's Child Abuse Squad that an underage girl had been procured online for sex.

Noor Raad, 21, allegedly used social media to procure a 12-year-old girl for sex. Credit:Facebook/ThundahIllestInTheGame

Police will allege Raad, 21, spoke to the young girl on social media and then arranged to meet her in person.

They allegedly met once in May and had sexual intercourse.