IS is IS. "Is meaning equal" is tautology. Is is simply is.

Taken in the contest of the song Baby's Got Back by Sir-Mix-Alot he is referring to Florence Griffith Joyner a track athlete in the 1988 Olympics who defiantly fits all the other descriptions of what he likes in women mentioned in that song. Not some soda why on earth would you want to keep your women like a soda anyway?

Conjunction of I and was for I was.

A word that, despite being among the most common in the language, not everyone is sure of the meaning of.

In slang, "is" is used to replace "are"

3rd person singular of "to be"

A perfectly acceptable beginning to a Facebook status update, no matter how grammatically incorrect. Most notably when a person has bad taste in music and uses song lyrics for status updates.