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1.
When researching a topic online, on a website such as Wikipedia, "Tabbing" is the act of opening multiple links in new browser tabs, subsequently leading you astray from your original topic but simultaneously introducing you to new ones.
While tabbing Jaque Derrida last night I discovered that Double Dare was televisions longest running kids game show.
by Atomic Bear June 12, 2011
 
2.
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...
by TheAmazingJack January 22, 2013
 
3.
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.
by Cleg January 11, 2008