The sound emitted by a fangirl when she finds herself or her friends referenced in Wikipedia (c.f., "squee").
I was looking up "Duck Duck Goose" on Wiki to answer a question by a friend, and my daughter was reading over my shoulder. When she saw that Wiki mentions a gaming session she was part of at a Con this year (as the origin of "Connecticon Duck Duck Goose"), her Wikisquee nearly deafened me. c.f. Wikisquedian - a person who has emitted a wikisquee.
by C. Perkins December 04, 2007