Stands for "Single and Looking". Often used on networking site profiles like Myspace, Facebook, and others. Also used to describe roleplay characters looking to be paired up with other roleplay characters.
S-L can be either a name or noun, Sometimes people or objects are S-L.
Everyone always asks what S-L stands for, however it stands for whatever you want it to stand for. Its most popular definitions are Slutty Loser, Sex Lover and Stupid Loser.
S.L.P.D. stands for 'Sweet Lincoln Park Dude', which refers to type of male you may commonly find in the famous upscale neighborhood of Lincoln Park in Chicago, IL. They are usually found wearing collared shirts, North Face apparrel, or designer t-shirts. SLPDs are also usually found in large groups at overpopulated bars/clubs drinking Heineken or overpriced liquor. They are always judging themselves (and others) on where they are, how they look, or how much sexual activity they can engage in.
"You want to go to that club?! Do you realize how many S.L.P.D.s will be there?!"
"Wow, maybe I should pop my collar so I can fit in with all the S.L.P.D.s here."