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1.
(Comp Sci.)
Amount of memory equal to 1024 Megabits (1,073,741,824 bits) of information. Abbreviated gb.

gb = Gigabit
gB = Gigabyte
Examples:

gbps (Gigabits Per Second)
gBps (Gigabytes Per Second)
I downloaded at 3gbps.
Which is approximately 3072 mbps.
by VoiDeD May 01, 2005
 
2.
The Ethernet speed everyone has to have, until 10 Gig comes along.
I gotta have Gigabit, gotta, gotta, gotta!

Shut up, you undeserving piece of crud and be happy you have a network at all!
by John Stigall June 02, 2005