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1.
southern lights is incense that makes you freaking high more than regular weed for an hour maximum.
it doesn't show up on drug tests.
& it's legal
Oh shiz, Bobby and I were so high off southern lights last night, we forgot which way was north and which was south.

southern lights is so good
by rachel fratz September 25, 2010
 
2.
A buttplug with multi-colored LED lights that emit a light show similar to the Northern Lights.
It's like the Northern Lights, but it's called the Southern Lights because it's in your butt.
by TheBIRDM4N February 03, 2014