ain't nothing but a thang

"ain't nothing but a thang" comes from African-American Vernacular English or Multicultural London English and means that particular thing or person is not important; it doesn't matter. It has spread well beyond its origin through hip-hop, drill, TikTok and gaming, so a teen of any background may use it. It is not in itself a sign of bad behaviour; it is a style of speech the way 'cool' or 'wicked' once was. The conversation worth having is about respecting where the language comes from, not about banning the word.

"ain't nothing but a thang" is informal, ethnically marked slang English meaning that particular thing or person is not important; it doesn't matter. It is mainly used in North American English. A more formal or neutral equivalent would be something like "that particular thing or person is not important" expressed in standard vocabulary. A common mistake is to assume "ain't nothing but a thang" can replace its standard equivalent in every register; keep it for spoken or casual situations and use the formal form in writing.