Green’s Dictionary of Slang

1. (US black) to indulge in a session of ritualized mutual insults; usu. as joning n.

1940		Davis & Dollard Children of Bondage 226: Judy's clique ‘joans’ him about his father's staying at home, not working, and giving his mother so many children; and about Lillie's and his other sisters' being ‘whores’.
1970		R.D. Abrahams Positively Black 132: The practice of joning is quite prevalent among young ghetto dwellers [...] The exchanges can occur between two boys who are alone, and it is even possible for them to jone on some third absent person, usually one of their peers.
1991		Eble Campus Sl. Fall 4: joan – make fun of. Stop joaning me.
1994		N. McCall Makes Me Wanna Holler (1995) 24: A funny-looking haircut was an open invitation to being joned.
1997		C. Briscoe Big Girls Don’t Cry 17: At school, these girls stood around on the edge of the playground wearing black leather jackets, sneaking cigarettes, and joning on each other.
1997–2000		College Sl. Research Project (Cal. State Poly. Uni., Pomona) 🌐 Jone (verb) To talk about. To rag on some ones gear. To say very mean things about some one.
1997–2001		Online Sl. Dict. 🌐 joan v 1. to make fun of. Example joan: ‘Your pants are so tight you need the jaws of life to get them off!’ Also joan on. (‘Don’t get involved, they’re just joaning on each other.’).

2. (US campus) to be idle while pretending to be busy.

1988

Eble Campus Sl. Oct.

3. (US teen) to gossip (maliciously); to deride.

1998		Megan Ferguson ‘Unstoppable Sl.’ in Columbia Missourian 19 Oct. 1A; 8A.
1998		Odessa American (TX) 17 Nov. 24/2: Not that I’m jone-ing New York City.
2008		in J. Miller Getting Played 86: Kevin described an incident in which his cousin ‘just started jonin’ on [this girl], talking about her shoes and stuff and made her mad’.