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When one is anally penetrating a girl, they ask her whether she has to defecate... and if so, one will pull out whilst the feces is traveling out of the girl's anus. Whilst the feces is traveling out of the anus, one must grab the feces (making sure that it comes out in a long thick strand and does not break) then smack the girl across the face with the so called Doo-doo.
Hey man, i gave Kayleigh a Doo-doo Smack last night after she gave Nathan head!

Damn man, that bitch deserves it.
by igottaslug July 23, 2010
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