Very tight, upper-thigh length shorts that were popular in the 1980's and were a staple of Tom Selleck's wardrobe in the popular television series Magnum P.I. These shorts usually clearly outline one's package and leave nothing to the imagination. Frequently worn by those with a mullet.
I was out of clean clothes so I threw on some Magnum PI's. I spent all day tucking back the meat to keep from playin turtle and scaring the locals.
by Salvadore McGillicutty June 17, 2008
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When you take such a huge dump it forms an island in the toilet. A Poop Island.
After last night’s chili dinner, I formed a Magnum PI this morning.
by TrashPanda81 February 16, 2022
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