A fork of Rural Dictionary
Sneak dissing is to make fun of, diss, or roast someone else without telling them, normally in a whisper.
For example, if you are whispering to your friend about someone else that is right there and he doesn't hear it, it's sneak dissing. However, if you say it loud enough but he is too busy in something else, it isn't considered sneak dissing. Commonly referred to as snake dissing by wiggas.
Bob *whisper* Deshawn is such a bitch.
Dontrell AY DESHAWN THIS BOY BE SNEAK DISSING!
Deshawn Wor'? Square up.
To talk about someone outloud in that person's face, only a few people know, and laugh amongst themselves.
"Tom sneak dissed on Dude, ain't nobody catch it"