it means on god, but using the rastafari term jah instead of god. or its referring to xxxtentacion the rapper
"I fucking hate you on jah"
by lolololololololololololololoI May 19, 2021
Get the On Jahmug. by Posited November 23, 2021
Get the Jahmug. Harry: So your saying that's a website where you can find neat slangs easily?
Me: Jah, & it's called urbandictionary
Me: Jah, & it's called urbandictionary
by Ashallinoo May 21, 2021
Get the Jahmug. by Jacob the sax October 8, 2020
Get the Jahmug. by undercover plumber September 27, 2010
Get the Hoo Shaj Jahmug. 
