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Used to exaggerate and explanation of how long ago it's been since you've experienced such event.

Girl used by Men.
Boy used by Women.
1. Susie: "I haven't heard that song Since I was a lil boy!"
2. Bill: "I haven't been to Burger King Since I was a lil girl!"
Since I was a lil girl/boy
by Doc Anarchist April 12, 2013