Short for "Starting Price". Originally a gambling term for the odds that would pay-out on horse races. In modern usage it is a generic term used when one wishes to receive a clear and concise response. Similar to an "executive summary". Used in the UK in the same way as "bottom line" in the USA.
Person 1: Hey nice T-shirt!
Person 2: Thank you, actually it's a second-hand T-shirt.
Person 1: I know, you're too poor for more than that.
Person 2: SP !
Short for Standard Practice. Often used as a reply by an individual to another who has told a story or described what they have recently done which is deemed as "standard practice". Is often used sarcastically.
'Suppressive Person' as coined by self-proclaimed Scientologist, Tom Cruise in the ever increasingly popular interview seen on youtube where he can not control his laughter and brags about stopping to help people who are in accidents along the highway.
"They said: 'so, like... have you met an SP?'" <cackling laughs> "And I looked at them and...You know..."
"And I thought how what a beautiful thing because maybe one day it will be like that. You know what I'm saying? Maybe one day it will be that..." <can't control his laughs> "Wow, SPs, like, they'll just read about those in the history books, you know." --Tom Cruise