A complete physical domination that is highly unexpected but leads to some sort of life lesson.

Utter and complete domination, physically or mentally.

That one time you saw your dads dick when you were a little kid like walking in on him in the bathroom and everybody knows that shit was huge

The Eagles really got dad dicked by the Browns this week.

That experienced penis that can only be obtained through countless sessions of the same old with his wife. Ex: I fucked that girl so hard last night I gave her that dad dick.

1) only after years of intense training amd experience a man has mastered the art of sex.
2) going through 2nd puberty, a man's penis has gained more girth.

Accomplishing both, not just one, will give a man the status of having a "dad dick."

Upon witnessing a live vaginal birth of your first child and seeing the mangled mess that is the vagina you’re married to your brain triggers a rush of blood to your dick instantly increasing the size and girth up to 200%. In other words, C-sections have been effectively shrinking Dad Dicks since the late 80s early 90s.