It is when you are sitting there minding your business and all of the suddun you start sweating because you have to shit so bad. if you don't make it to a toilet you will shit yourself. it usually happends in the most inconvenient moment like being on a first date with someone or you are in mexico with no indoor plumbing or in an area with onlt johnny on the spot available.
After eating that taco bell it gave me a sneak attack.
Really awesome move where you bang a chic in the ass, and just before you cum, pull out and spit on her neck. Innocently thinking you finished, she turns around, just in time for you to nail her in the face.
The act of sniffing one's own fart heavily through the nose, followed by walking over and blowing it in someone's face through the side of the mouth. Its best not to be caught, hence the sneakiness factor.
Did you just see Reverand Norris give the little fella a sneak attack? That was crazy right there, he has no idea where that stench came from!