1. Star Trek: Betazoid; literally "the first".
2. The first lover to touch your soul or spirit as well as your body.
3. Beloved; soulmate; heart and soul.
4. Bonded in mind, body and spirit.

See also: my sun-and-stars, Dothraki origin.

When some little bitchboy is acting like a little tiny pee pee poo poo baby and messing up the group plans.

Imzadi is star trekese for your ulimate soulmate. It is used when you and your lover connect in every single way, beyond our physical realem.

1. In the Star Trek universe Imzadi is a Betazoid word that translates roughly into "Beloved". It basically means someone who is very dear to you; a soulmate. It is also used as a term of endearment.
The most famous usage, of course, was between that of Counslor Deanna Troi and Lt. Cmd. William Riker on Star Trek: TNG.

2. The name of Ami's black and white female housecat.