Bill Willmerdinger (aka Qob) (BabelCon 2 [4/1997]):

I had needed some technobable once and created "inverter" [yoymoHwI'] ... which Marc [Okrand] said was perfect.

Related words:

yoy be upside down (v)
chong be vertical (v)
taH be at a negative angle (v)
lol be in an attitude (v)
tach turn over (v)