to drape one's limp penis over a sleeping friends forehead, nose, ear, etc. so that it resembles laying a gummy worm across the sleeping individual. Bonus points are awarded for creativity, such as painting the penis prior to placement.
Hey, why is he so pissed?
I just gummied him, he woke up with my inch worm on his eye lid.
God damn you. That's the 3rd time you've gummied me this week!
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