To high five someone whilst affecting the Vulcan Live Long and Prosper hand.
Person A: Dude, you'll never guess who I saw on the street today. T'Pau from Enterprise. For realsies!
Person B: No way! You have to hit this, brother.
(Sci-five ensues)
Scifidelic "pronounced: si'-fi'-del-ik" is music that is from a science fiction origination, and inspires a listener to imagine oneself to belong or exist in a self generated fictional futuristic society. The Word was created circa 1991 by Caustic, a music producer. It is also name of a sci-fi cultural band founded in 1990's, with a cult following amongst sci-fi fans.
A person who is neither a scientist nor a science fiction writer, but writes and blogs about possible sci-fi scenarios for the future.
Although polar cities do not exist yet, there's a blogger who envisions them as safe refuges for survivors of global warming in the far distant future, and he calls himself a scifientist.