Green’s Dictionary of Slang

jawn n.

[ety. unknown; the term is considered to have originated in Philadelphia, for which see https://www.merriam-webster.com/words-at-play/jawn-meaning-origin and https://www.atlasobscura.com/articles/the-enduring-mystery-of-jawn-philadelphias-allpurpose-noun]

(US campus) an indiscriminate term, usu. used of something or someone that causes happiness, joy or excitement; also used as adj.

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UrbanDictionary.com 🌐 jawn. a word used to describe anything. ‘yo man this jawns hot as hell yo.’ ‘Naw yo this jawns way better.’ ‘Did u see that jawn walking down the street the otha day? daaaaaaamn.’ ‘Get off my jawn.’.
Central Cee ‘LA Leakers Freestyle’ 🎵 You call her ‘shawty,’ we call her ‘jawn’.