to leave a party or group of people at a time when no one knows you left. otherwise known as the superman syndrome.
"What happened to you go last night? Did you shady dip again?"

"Laura was all over me but Sara called, so I shady dipped"
by rupe February 22, 2008
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When you be slammin' all night and errbody fall asleep and you be dippin' before anybody wakes up to say goodbye.
Rhonda: "I got with the hottest dude ever last night"

Jade: "Oh sweet. Did he drive you home? What car does he drive."

Rhonda: "Bitch, I dunno. I shady dipped befo' he even woke up"

Jade: "Dag, Girl."
by Cezaro May 5, 2010
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