A type of fart that is done while sitting, the one-cheek sneak is done by leaning to the side to let the gas excape. Very handy when sitting on a smooth, hard surface while wearing shorts, to prevent "hovercraft" sounds.
To avoid disrupting the classroom, Johnny let out a one-cheek sneak, and nobody was the wiser.
A sneak diss is a bitch move. A sneak diss is when someone makes a rather vague post describing a certain individual in a derogatory way or a situation that multiple people know about, but while describing the person they refrain from using the person's name as to not directly make a connection between the post and the individual. This is a way to keep from being confronted by the post
Dissed Person: Wow, Harold just sneak dissed me on his Snapchat story.
Other Person: Damn, Harold's such a little bitch. Why wouldn't he just say it to your face?