A dirty gizmo is being slapped or hit.

OR:

Getting slapped in a dirty way (butt, boobs, ya know), then you yell "DIRTY GIZMO!"
Person 1-"Did you just slap me?"
Person 2-"yeah, I dirty gizmo people frequently"

OR:

Person 1-"omg, I just walked down the hallway and that guy slapped my ass!"
Person 2-"Oh dang, he dirty gizmoed you!"
by breezyboo123123622 May 4, 2009
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