is ob mod a form of manipulation

Yes, as are all social interchanges.

http://faculty.css.edu/dswenson/web/OB/obmod.html

You may want to do some recreational reading on transactional analysis from Eric Berne's work sixty years ago.

See the OK cluster herein:
(Broken Link Removed)
Notice the common elements in OPMOD.

To answer your question, "ob mod" is not a commonly known term or acronym in the context of manipulation. It's possible that you may be referring to something else. However, in general, manipulation refers to the act of skillfully influencing or controlling someone or something in a dishonest or devious manner to achieve personal or hidden goals.

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