gigglebitch 

(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.

gigglebitch by Lexicontastic January 14, 2010

Gigglebitch 

(n.) thot, slut, fake bitch. That party-every-weekend, pretentious fine-arts student "friend" that sleeps with your creepy foreign visitor in your empty apartment.

He slept with that gigglebitch!? I thought his standards were higher.

Gigglebitch by Joosh947 September 10, 2016