The act of anal intercourse while free-falling at terminal velocity during a tandem skydive.
Bob came and went during that Dirty Mariel.
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In the 90s it was the term used to describe the viewing of premium porn channels that your parents had not purchased, characterized by plenty of audio and a severe lack of video, thanks to the jammed signals.
My parents grounded me when they caught me trying to watch squiggle vision this past Friday night.