sci-five 

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)

sci-five by Live Long & Prosper July 31, 2009

Sci-Five 

When you high-five someone to acknowledge the awesomeness of science.

When we watched a TV show about space, my son was so excited that he gave me a sci-five.

Sci-Five by Fever Dog September 23, 2015

Sci-five 

Similar to a High Five But when you cannot physically see the person but yet feel the need to high five them.

A virtual high five

Dudes on two sides of a room seperated by a wall.

Dude 1: (PHHHFFF) Dude, I just Cropdusted my side of the room
Dude 2: Nice, Sci-Five!

Sci-five by Michael Scarn F.B.I. October 11, 2009

Scifive 

To give someone a high five using Spock’s “live long and prosper” sign🖖

I gave the DBOTY winner a scifive!

Scifive by Scifive July 20, 2019