Should've done a "One Cheek Sneak"!!
My favorite brilliant comedian George Carlin wrote about it. Hahaha, yeah.
A type of flatulance 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. Hahaha