A cutesy variation on the word snapper (which is obviously slang for vagina)
Used by parents who don't feel comfortable using the anatomically correct terms. These same parents refer to a penis as a ding-dong.
Young girl talking to her Dad.
"Daddy my snap-a-doo is itchy what do I do?"
"Tell your Mom"
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Excitement that you cant explain in another word
Def 2. When you mess up
Snap a doodle doo!!! I won the game!!!
Snap a doodle doo!!!! My dog ate my homework!!!