Top Definition
The act of placing your penis on the toilet bowl rim and repeatedly slamming the seat down on it.
"That kid has got problems, when I went into the bathroom he was schlong slamming with my toilet bowl."

"Dude, I took a viagra, and my hard-on won't go down." "Go in the bathroom and try some schlong slamming, might help"
by GFoyle June 11, 2013

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