Sinkhole 

Person A gets on the top of a bunk bed and proceeds to strategically aim his solid fecal matter into the open orifice known as the mouth and or nose of person B, who is sprawled eagerly on the floor below.

Last night I dropped a sinkhole right in Susan's mouth. It was hot!

Sinkhole by The Rathbone Food Staff March 31, 2008

Sinkhole 

(n) Drain. The hole in your sink.

Hey Neena, You washing them dishes, bitch?
Nah N*gg@, we got a clogged sinkhole.

Sinkhole by Clyce October 18, 2017

sinkhole 

when a womans vagina is so loose and hollow you can hear the ocean it is know as a sinkhole

DO NOT under any circumstance have sex with a woman that has a sinkhole if you do you will never retrieve your penis

sinkhole by chico May 5, 2003

sinkhole effect

-the anal cavity of a woman sunken and gaping
-gaping hole with surrounding tufts of hair

(dialogue)
ashanti- i got the sinkhole effect when i was with jordan last night.

keisha- whats the sinkhole effect?

ashanti-after i got fucked in the ass by jordan, my butthole stayed wretched wide open

keisha- oh so u got a loose asshole!

sinkhole effect by Jordan Campeau July 2, 2006

Australian Sinkhole 

When you tip a Vegetables wheelchair so they can suck your dick.

Bro last night I was with this hot af paraplegic and she gave me the good ol' Australian Sinkhole

Australian Sinkhole by Ackrynom April 22, 2018

Cultural sinkhole 

A popular cultural trend that leaves a negative impact on society, either through encouragement for the populace to ignore greater issues, even regarding itself, to direct more attention to instant gratification (in more modern terms, "consume product and then get excited for next product"), mass psychological harm, glorification of disreputable traits such as crime, vulgarity, or materialism, or other effects that can leave a moral of intellectual "hole" in societal values.

K-pop is a commonly cited example of a cultural sinkhole, with it's propagation of unrealistic beauty standards, immoral corporate practices, and rampant idolatry of people based on personality instead of talent, all upon impressionable youth, it's main demographic.

Cultural sinkhole by mildanger September 22, 2019

Philadelphia Sinkhole 

A Philadelphia sinkhole occurs when a person has been anally penetrated repeatedly, and their taint has been enlarged, revealing a swirling mess of shit and cum, resembling a sinkhole.

Dude I'm not gay, a couple of my bros just Philadelphia sinkholed me.

Philadelphia Sinkhole by jrjrjr May 16, 2015