Underground Boxing 

boxing that partakes underground that's not mainstream for the fame and glory and doesn't seek for popularity

"aye bro you trynna go to the boxing match?"

"which one?"

"its underground boxing bro you wouldn't know but its going to be sick asf"

Underground Boxing by idkbroicantcomeupwithanything December 2, 2018

Underground Bunker Vibes 

Talking about having sexual intercourse in an underground bomb shelter

Friend: How’s things with your the girl your talking to
You: Well she’s giving off Underground Bunker Vibes

Underground Bunker Vibes by Hbnbs March 26, 2020

Underground Mafias Army 

A Club Penguin army community full of absolute wetwipes. Typically they go on Club Penguin Rewritten and try to annoy innocent players going about their day. The HCOM is clueless as well.

Did you hear about the Underground Mafias Army again? They're a bunch of nimrods.

Underground Mafias Army by clubpenguinlad December 18, 2020

Underground Country 

A large piece of land only accessible by those who are invited and/or have completed the initiation ceremony.

Antopia is an underground country ran by the mafia king.

Underground Country by Kg_cv February 16, 2021

Underground 

Subterranean.

Underground artists spent most of their time in rabbit holes or hawking their shit from private parking garages at night. They thought the sun might turn them too dust, and they didn't want to lose their fangs.

Underground by Solid Mantis March 26, 2021

Underground Street Cheese

Dick cheese

Hey, how do you get rid of underground street cheese?

Underground Street Cheese by SMARTFACE January 19, 2022

Underground 

1. Dead/Passed away

Hafiz : My father is already Underground

Underground by Nazsh02 September 6, 2022