GIWISI definition by Slang.net
This page explains what the acronym "GIWISI" means. The definition, example, and related terms listed above have been written and compiled by the Slang.net team.
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Someone who agrees with you may use GIWISI to stand for "gee, I wish I said it." This acronym means a person not only concurs with your opinion but also wishes they had voiced it first.
Friends, family members, and co-workers are most likely to use GIWISI after you express an unpleasant or difficult truth. For example, if you tell your brother that you finally confronted your mother about her hoarding tendencies, your bro may respond with GIWISI.