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When you're smoking weed and you take a hit and you hold in 100% of the smoke from the inhale, exhaling *zero* smoke from the hit. Done in order to get maximum effect from the weed. Requires great skill and is worthy of respect from other smokers.
"Yo I was ripping a B with Joey Fatone the other day and he was totally zeroing every time ... insane!"
Zeroing by Ol' Prospector October 19, 2009

zerowing 

The video game that spawned all your base due to its crappy translation. It's actually very fun, though primitive and kind of hard once you get into it.
I play Zerowing to watch the beginning because I'm easily amused...
zerowing by Zi October 3, 2004
When two individuals partake in consuming each others anus's.
Ben and Jenny were totally Zeroing last night.
Zeroing by Jack Fearow December 1, 2016
When you inhale smoke till nothing comes out when you exhale.
“Dude my mom came in so I had to zero the smoke, I need to get better at zeroing because some still came out when I exhaled.”
Zeroing by Buggy11706 February 6, 2022
The fermenting of zupezeros sperm
I am currently zeroing
zeroing by Jessepinkpussy July 30, 2025

Tony Hawk, The Knuckles Zeroing in on spartan locksmiths (left shank accidents)... 

What I call homo-sapiens addicted to abscesses.
Person 1: Are you addicted to abscesses?
Person 2: Yes.
Person 1: Tony Hawk, The Knuckles Zeroing in on spartan locksmiths (left shank accidents)...