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1.
1-A large tank used within waste disposal and sewerage cleansing.
2-In cockney rhyming slang, a yank.
Those stupid septic tanks have just re-elected George Dubya Bush! Bang goes peace! More terrorism activities will happen now, this enacted by the yanks on Iran or Syria!
by JT December 04, 2004
 
2.
Interchangeable with Yank or Yankee, a euphemistic stereotype for Americans who spill forth verbal filth like a sewage plant.
Mate, I took that septic tank from the other day out for a surf. I was hoping the sharks would rip him to pieces but it looked as though they swam away in terror. It seems not even a Great White Pointer can swallow his bullshit.
by name different November 20, 2007
 
3.
The art of while being intoxicated placing a funnel into a woman's anal cavity and vomiting into said funnel.
wow, i am so drunk but that girl has a nice ass i would like to septic tankher.
by J.M. gigitty August 08, 2009
 
4.
Pissing and shitting in a girls mouth and duct tapping it shut. All during sex.
"I gave Tina the septic tank last night."
"Sick."
by cfch September 06, 2006