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1.
Variation on the phrase cock blocking where a doctor is prevented from carrying out a medical procedure usually due to a hospital administrator or lack of patient consent.
"I was going to try the new experimental treatment but the patient's parents are totally doc blocking me."
by Alejandro89 October 28, 2008
 
2.
Variation on the phrase cock blocking where a health care specialist is hindering, by whatever means, the chances of another male from flirting or getting a sexual encounter with a female.
more like doc blocking to me
by Bob on the FOB January 28, 2011