SIO

Sex in Opposition: the (non)-act of (non)-sex between two or more people. SIO is typified in musical form by songs such as News from Babel's "Dragon at the Core" and Domestic Stories' "The Same River"

I've got the latest order from ReR in! Let's put on the Necks and practice SIO.

sio

Extreme sexy beastly mf

Man, Sio gives off such a big dick, dilf energy!

SiO₂

sand; glass; quartz; amethyst; silica; silicon dioxide.

People, go build a SiO₂-castle.