"down with" love

Hi there,
anyone know that verbal phrase?

From the Urban Dictionary online:
Down with -- Urban slang signifying total agreement with and/or understanding of a person or concept.

I'm down with G-O-D.
Roscoe is ma' boy; I'm down with that brother.

Also:

Down with -- 1. Part of a group. 2. Supporting or endorsing a group or program. (From Black Talk: Words and Phrases from the Hood to the Amen Corner by Geneva Smitherman (Houghton Mifflin Co., New York, N.Y., 1994.)