1. It's synonymous with grinding, however its connotation is more of a hardcore grind.
2. When girls seek guys, mostly Puerto Ricans/ African Americans, to touch her butt to his genitals.

3. Grinding like an Orange to Orange peeler.

Don't have a clue what this stands for, but it's a digital theatrical sound system developed by Lucasfilm Ltd. It was named after the classic George Lucas film, THX-1138.

Taceo is the legendary Star Wars Jedi, he was never featured in any of the Star Wars movies, because George Lucas wanted to keep this "Taceo" as a myth.

He have been in several unknown cult-like organisations like Nomidy Jedi Order, and Defensive Force (as far as I remember), and some people say, that they've met this master Jedi in a game called Jedi Knight: Jedi Academy, but this might just be rumors. Today, in our current age, most people (Star Wars freaks) use the word "Taceo" as a synonym to other words, like in the following sentences:

Cute Butt. Massive Penis.

A person who resends or forwards spam email.
Respaminator = one who continuously respams.