look up any word, like blumpkin:
 
1.
A burger with seven patties.
One more septo for him, and it's goin' be artery gridlock!
by Tony Perkis Sr. September 04, 2007
 
2.
A derogatory term for an American. Derived from "septic tank", which is a samll sewage system in many surburban homes.
This place is crawlin' with McDonalds eatin' septos.
by Matthew Hebert April 16, 2006