The razor-thin, paper toilet seat covers dispensed in public restrooms with the sole intention of deluding the user's basic hygienic standards, enabling him or her to “take up throne” in a creepy bathroom stall.
"I had to crap so bad that I covered my mouth and nose, waded through what looked like bile on the gas stations bathroom floor, kicked open the stall door, pulled out one of those ass gaskets from the dispenser, and calmly sat upon the fidgeting toilet seat."
Noun.
History: Believed to be a Gallagher-ism (American comic of 1980s & 1990s known mostly for pulverizing melons w/a huge slegehammer in his shows).
Definition: Those wisp-thin, slightly waxy paper toilet seat covers offered in public toilets to protect one's bodunkadunk from coming in contact with someone else's funk.
When using the toilet at the Port Authority Bus Terminal, always put an ass gasket down before you cop a squat.