The actual definition of a Houdini shit is a turd that contains enough negative buoyancy to drop to the bottom of the toilet and glide it's way down far enough into the toilet's exit portal that it appears to have mysteriously disappeared or make you question whether or not you even crapped to begin with. It often times shares the characteristics of a Jesus Shit, which is the term used for turds that leave no residue on the anus.
Boy, today's Ziggy cartoon was pretty funny. Oh well...I'm done wiping so I guess it's time to stand up, flush and get back to wor- OH MY GOD! HOUDINI SHIT!
The act of taking a shit, and not having to wipe due to the turd not leaving a mess on the outside of your asshole.
Dude, good thing my shit was a Houdini Shit, there wasnt any motherfuckin TP in the bathroom.
When you take a shit and know something came out but you look in the toilet and nothing is there
where the hell is it, it pulled a Houdini shit!
(doors slams by itself)
Man: O hell no dats some houdini shit