A person who goes on DLS (the thread Dirty Little Secrets on GaiaOnline inspired by Frank Warren's PostSecret books) and lets out their feelings and secrets there.
DLST is an acronym for "Dirty Little Slut Tattoo". This specifically refers to a tattoo found on the lower back of a female. The tattoo generally consists of a celestial object or a decorative horizontal pattern on the external lumbar area, slightly above the sacrum. Such a tattoo obviously has no use to the owner and can only be enjoyed by someone else from behind.
Self-explanatory. A secret thing (such as a love affair, or shameful thought) that you don't want anybody to know. The phrase was popularized by the song "Dirty Little Secret" by the All-American Rejects.
when you act promiscuous, petty, spiteful, overbearing, rude, or if you know someone well enough it could be used as a term of endearment
after i see someone at the club grinding on my girlfriend i say out loud "What a DLS (dirty little slut)" and the girl has no idea what a DLS is, or when i talk to my best friend online and say "Hi DLS" it's used as a friendly term because we both know what it means and we are not using it literally...