A person who is a great fan of Dr. McGillicuddy's Peach Schnopps or fireball whiskey. Joining the Dr. McG club involves a great love of Dr. McGillicuddy drinks and/or binging on Dr. McGillicuddy. Bitches O' Dr. McG is generally refered to a group of girls who are all great fans together.
"Oh man I totally joined the Dr. McG club last night"

"She was a founding member of he Bitches O' Dr. McG"

"She spends all her time with the Dr. McG club"
by JexMcG October 25, 2009
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