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Having a Dan refers to a person male or female, who chooses to masturbate EXTREMELY regularly!! You don't care where you are and who your with, you'll march off find some quiet corner and have special time.
Walking through the local park "Man i really fancy a Dan"

Having tea with the family "right i have finished, off for a Dan"

"where's Rich?" .."oh hes having a Dan"
by tallfatguy February 08, 2010