sitting on a secret

Commonly used by drag queens, means 'to have a dick' or to be 'sitting on a dick'.
Phrase inspired by the infamous and iconic drag queen Alyssa Edwards on Rupaul's Drag Race: Season 5. She is also known for saying "Back rolls" and "look how orange you fucking look, girl".
song written on Rupaul's Drag Race: All Stars 3, sung by Milk, Chi Chi Devayne, Aja, Morgan McMichaels, and Thorgy Thor.

Man 1: oh, look at that girl over there. She's hot.
Man 2: nah, dude. That 'chick' is sitting on a secret.