commonly shorted to DCM
used as a response to a negative comment/diss/action against oneself where your cred is being damaged
probably originating with the term "cat" describing someone more hiphoppity hip than yourself who may inadvertently make you look lame, therefore "catting" you.
Tyrone: heard you sharted the other night bro?
Joe: yo don't cat me blud.
Sam: yo where are your straighteners blud
Gregory: (continues listening to biggie/jiving/having intercourse)
Sam: YO stop catting me broseph.