Word used by for Americans meaning "Septic Tank Yank", The word was bacically introduced because all Americans talk a load of shit.
"I wish the Seppo would shut up"
by LMent June 15, 2005
seppo (n.) seppos (n. pl.)

Derogatory term used by British and especially Australians for all American nationals.

1) Short for 'Separatist', i.e. 1776 separation from the Kingdom of Great Britain.
2) Derived from rhyming slang (Septic Tank = Yank).
1) In their country, seppos give tips regardless of the poor service.
2) My grandad was stationed in Pacific with the seppos during the second world war.
3) Person A: I am from Hungary
Person B: Is that even a country? I know that Europe is a country...
Person C (to Person A): Don't worry, she's just another typical seppo.
by duck n weave August 8, 2012
A derogatory term for Americans, originally a word play on "yank" rhyming with septic tank, shortened to "seppo". The term became popular among the British and the Australians around the time of WWII, when American soldiers were staged in both respective countries on the way to battle in Europe and Asia. At the time, the populations of both countries greatly resented that the Americans were able to seduce their woman with such ease. Not having much recourse, they lashed out the only way they could, creating silly derogatory terms.
"Oi, thayt bloody seppo had saix wit me wife aynd me two sistuhs!"
by uglyamerican April 9, 2010
What Aussies and Poms call inhabitants of the USA. The majority of them have incredibly low intelligance are are obese.
I don't want to go to the USA, I might get raped by a stinking seppo.
by Poomandow May 28, 2005
ffs seppo is here
by youknow124 February 2, 2017
A person from the Australian state of New South Wales; used as slang derogatory by Victorians and Queenslanders.

Explanation: The three eastern states of Australia are Queensland in the north, Victoria in the south, and New South Wales between them. They are colloquially seen as being Canada, Mexico and the USA respectively. Since seppo is a slang term for American (see above definitions), it becomes a slang term for a New South Welshman.
Victorian: The damn seppos won the 2005 AFL premiership.
by Aspirex January 10, 2006
A norwegian tradition where you walk up to someones front door and take a shit then you light your shit on fire and knock on the door. The person who opens the door will step on the fire to put it out but they will get shit on their foot.
I just did a huge seppo kuj to my neighbor
by blackman999 April 27, 2020