Reference to Donald J. Trump, whose last name is spelled with a big "t" and a small "p". Play on "big talk, small penis". Refers to a person who makes loud and annoying claims to make up for deep insecurities.
"You know that Donald J.? He's the real deal, tells it like it is, right?"
"Naw, he just talks big. Big T Small p, know what I mean?"
You have the right to ask someone to prove they don’t have a shrimp. They must not back down today..
Ally: I am so sad, I think Johnny has a small d. Maria: It’s okay, since today is “National Prove Your D Isn’t Small” you can ask him! Ally: Really??? Maria: Yes!
A penis which is small. Generally held by those less gifted, not just white people. Medical facts have given explanations for that urban myth and have proven it wrong.