when both your dad and his brother were fucking your mum at the same time befor you were born.you have no idea who is your real father so they are both uncle-dad.
"uncle-dad i caught uncle-dad in bed with mum again last night"
"i will kick my brothers fucking arse son don't you worry"
Ring up the late night T.V commercial's to get an 'insta-dad' delivered to your door. Insta-Dad is great for fulfilling the gap left by an incompetent or missing dad and is a great present for Christmas. Insta-dad never gets angry at you for smoking weed and does your homework at the same time as cooking dinner. Comes with 30 Day Money Back Guarantee.
Whats it to you?'s defintion is also quite acceptable and funny.
Taken from the popular film "Ghost Dad" it refers to males who have possibly fathered many children but do not have an active role in their lives or to refer to fathers who have died only to return to help there children with math homework
Maury paternity test episodes - The Ghost Dad disputes that he is the father of the crack whores baby