What is Blood Dip?
1.
Having sex while the girl is on her period.
You will know you got a blood dip when your cock is all bloody.
"Dude I was fucking my girlfriend and man it was the best blood dip I ever got."
"I cant believe I got a blood dip, it was so great!"
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1. 
Roughly defined as a one foot radius around a person.  It can only be entered by close friends, family members, significant others, etc...