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hyperassilation 

Extreme fear or panic may cause someone's asshole to open and close (ocillate) at a high rate of speed. Hyperventalation of the ass.
When her husband pulled up in the driveway, John began suffering from acute hyperassilation. He grabbed his underwear and socks and ran out the back door.
hyperassilation by Rockhouse July 11, 2009

hyperass 

That which accelerates one's assic functions.
That Snickers™ bar was HYPERASS, I got the shits!
hyperass by That P August 25, 2007