Similar to the word snakeman, a sneakman is a noun to describe someone who consistently goes behind others' backs for the sake of themselves, often with the intention of slighting another.
Person 1: Jeez, Simon fully went and shagged Jez's girlfriend!
Person 2: Fuckin dutty sneakman ent he
A fart so musically tuned it has a similar sound to a saxophone.
This can be caused by:
1: Being able to play a musical instrument amazingly well.
2: Playing the sax while eating beans or sprouts.
Not many cases of this have been discovered as of yet.
"Ooh Christ I just made an anus saxophone! Jesus, what a smell! It's like tear gas! I'm going to be sick! Oh well, it sounds very nice."