1 - mentally slow

2- Consuming so much alcohol (and / or) drugs that your IQ drops at least 60 points.
Dude - Did you hear that kid? What the fuck was he talking about?

Chick - OMG, I have no idea. His breath smells like dogshit though. Is he fucking retarded or what?

Dude - Nah, he's just slappy mappy.
by IRON SAVAGE December 04, 2011
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The act of back handing someone while wearing rubber boots.
Henry's father was so mad, he gave him the good ol slappy steak.
by Steak daddy July 10, 2018
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When u fuck ur girl so hard se shits in her ass and den u take salt and put it in her buttox
I want you to slopy slappy butixcake
by Hans gutenhagen May 27, 2019
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the yo mama joke but better.
Teacher: "Greg, can you please come up to the class?"
Greg: "Yo momma!"
Teacher: "Greg, I don't appreciate that language!"
Greg: "You slappy your grandpappy!"
Teacher: "Stop it, Greg!"
Greg: "Your great grandmammy has a big fanny
by Joseph Nuttingson September 25, 2021
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