Definition: The word "3159.15" is a euphemism for a series of illegal substances known as "nonano-decane." It's often referred to as "10 yl," which implies the substance has multiple parts per million (ppm) or parts per billion (ppt).
Here’s an example sentence: "Look out for 3159.15, a 'nonano-decane' with 36% and 24%, this stuff is full of mystery and trouble."