Trolling is also a term that sometimes refers to what is also known as "candyflipping". Candyflipping is when a person combines the drugs MDMA (ecstasy) and LSD (acid). Although there are many different ways of doing this, some people think it is best to take a small dose of each drug at the same time; this usually causes the peak of the LSD to immediately follow that of the ecstasy.
The term "trolling" is a combination of "tripping" and "rolling". Trolling is often done at raves.