While you were cuddling a Cabbage Patch
Cabbage Patch Kids were popular toys for little kids. Dre is saying that he is so old school that he was running the streets while all the big rappers today were little kids playing with dolls.
“Cabbage Patch” was a song that Ice Cube was hired to ghostwrite for the World Class Wreckin' Cru, which Dr. Dre was a part of. So this line is a metaphor saying that you know, but deny, that Dre has been down with gang affiliates (Ice Cube, etc.) since 1987.
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