This is when you take a small trash bag and place it over your partner's head when you're taking her from behind, then you close off the bag around her neck as you pull out of her vagina and go balls deep into her anus, she will expel an enormous amount of air to inflate the trash bag to resemble a Jelly Fish.
Dude, I went so far in her, so fast, she inflated the bag and looked like the Man-a-War Jelly Fish
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