1. (noun) any highly gelatinous/glutinous, substance with a largely clear (transparent) composition used in the context of sexual activity.
2. (tr. verb) to expose to, affect by or submerge in ecto.
"I haven't had sex for a month...I would love to ecto your little sis' right now."
The name itself is from the Happy Rhodes mailing list, but has since become a term in its own right.