What is poboy?

The act of drinking water really quickly, then spitting it up into someone belly button and then putting a pair of male genitals inside it.

My girlfriend texted me last night and asked me to perform a Dallas Poboy, It was amazing.

poboy - meme gif

1. A wonderful, tasty, sub sandwich consisting of various types of meat(s) and condiments.
2. A term to express great disbelief and disappointment.

1.I love me a poboy when I go to Jason's Deli!
2.Poboy, I just got whooped in Halo!