It is a slang term for the popular drug Cocaine.
Cocaine was first introduced to the US by colombia. nd became most popular around the 70s. The name comes from the name of the coca plant plus the alkaloid suffix -ine. Cocaine was also popularly used for eye, mouth and nasal surgery o numb the area.
yayo is a commonly used drug among many people in the southern california (hollywood scene) and in european countries as a social stimulant.
Cocaine is a central nervous system stimulant and gives the usrs intense feelings of happiness and energy.
Coca- cola ( the soda) originally had cocaine inside. hence the name coca-cola
cut me a line of yayo
pass me some yay