An acronym for Giggling Quietly Inside. Many times texters use LOL when responding when they really are just GQI.
Paul Texting: Hey Sandee, Did you see Trish fall down at the park yesterday? What a fool!"
Sandee Texting: "Yep, LOL!"
Paul Texting: Do you really mean GQI cause I know that you are in a meeting right now?"
Sandee Texting: "Ugh, yes....GQI!"