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Inserting a fist into the rectum and vagina simultaniously while "pumping" the fists in an in-and-out motion.
I was tabbing my girlfriend last night.

Or

I tabbed my wife.
Tabbing by Cleg January 15, 2008
Sorry I was tabbing’
Tabbing by Chabrill October 13, 2017
When you have an outline task when searching on the internet e.g. finding a rare item on shopping websites for such a long time that you have opened up a series of tabs to attempt to achieve this goal. The word is used in place of stating a URL when asked what you are doing on the internet
Person 1: Hey man, you've been on the computer for 6 days now, what are you on?

Person 2: I'm just tabbing for a new swimming pool filtration system.

Person 1: that's great, but seriously, take a shower...
Tabbing by TheAmazingJack January 24, 2013
The act of falling asleep while watching a film or tv show.
Can you please try to stay awake? You're tabbing again.
Tabbing by VMStraka April 21, 2018
When you have downloaded a cat extension on your browser, and you are so bored that you open hundreds of tabs to see how many cats there are in the extension.
"Johnny, stop tabbing and get on with your homework!"
Tabbing by a_zesty_boi June 14, 2018
The act of putting two or more drinks on your tab and proceeding to buy one for the boys.
"Don't worry guys/gals drinks are on me, I'm tabbing tonight"w
Tabbing by yamyamyomyom September 28, 2021