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1.
(gi gl bitch) noun (plural: gi gl bitch es) a person, usually female, and frequently in pairs, that laughs hysterically at something stupid and/or inside jokes, oblivious to any surrounding situations, people, or sleepers. Frequently makes fun of others' laughter when not gigglebitching, and does not realize that she sounds more annoying.

can also be verbed, as in "gigglebitching"
Cassie and Hallie were being gigglebitches this afternoon when they were giggling incessantly at god-only-knows-what, while poor Allie was out of the loop, and increasingly annoyed.
by Lexicontastic January 13, 2010