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1.
Sub-tweeting is the act of tweeting about somebody without actually saying its about them..
So sub-bitching is bitching about someone, trying to make it more generalized even though its clearly aimed at one person
For example;
Roqueesha: "Some people really don't know how to do their make-up."

Lily: "Is she talking bout me??"

Breezy: "Yeah she's clearly sub-bitching"
by Lil Mamas Baby Daddy May 07, 2014