When you say something that you later regret. Usually refers to times when you tell an embarasing story to your friends because you think it is funny, but they then use that story to make fun of you.
Drink spiking is the illegal act of placing a substance into a drink with the intention of causing harm to the drinker.
( www.wisegeek.com/what-is-drink-spiking.htm )
Police have arrested a 29-year-old Swedish tourist in Nelson in connection to an investigation into suspected mass drink spiking at a Napier bar.