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1.
the ability to utilize web surfing with multiple tab browsers
I'm doing some serious multi-tabbing right now, I'm managing my fantasy baseball team, checking my facebook profile, and watching the latest Justin Bieber interview on youtube!
by hardhitr3 July 07, 2011
 
2.
The internet phenomenon, in which one opens up multiple tabs such as social networking sites, Word Docs for homework, Youtube, etc.

If multitabbing occurs while a student attempts to finish homework, they will end up procrastinating and are likely to die painfully.
Student:

"I was multitabbing last night while I was trying to finish my term paper...and I didn't finish. I'm probably going to die."
by bowltheblondeseagull January 25, 2012
 
3.
When someone is on the intrenet and is using multiple tabs at once.
Person 1"sorry i didn't answer right away i was multi-tabbing"
Person two" What are you playing runescape?"
by Kambren August 01, 2009
 
4.
This is an action or ability or addiction whereby an individual who, to the annoyance of many, has multiple internet browser tabs open at once, usually 5 or more and often upwards of 15-20 and often for weeks on end. These individuals believe that they will, at some point in the next 12-24 hours, be able to browse the contents of each tab they have open and are irritated if the tabs are closed or "gone over" by a family member. More often than not, the individual either copies the tab links into an e-mail they hope to be able to find later or they close the tab reluctantly, realizing after 14-21 days that they will simply not have the time or that the contents of the link aren't interesting enough after all.
My day begins and ends with multitabbing.
by Doctora December 23, 2012