SLS (Noun) — A caustic detergent useful for removing grease; although commonly included in personal care items (shampoos and toothpastes etc.) it can irritate skin and should not be swallowed.
SLS (Noun) — A terrorist group formed in Peru in the late 1960s as a splinter group from the communist party of Peru; is among the most ruthless guerilla organizations in the world; seeks to destroy Peruvian institutions and replace them with a Maoist peasant regime; is involved in the cocaine trade. ex. "SL has been responsible for 30,000 deaths"