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Sepp, as in Septic Tank. Septic Tank is a cockney (East London) rhyming slang for Yank.
You dumb Sepp. = You dumb American.
by Commie April 06, 2004
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A guy who is pretty much in for anything, arts, music, politics, sex, sports, partying, name it he is in for it.
"Wow I've seen that guy kiss boys and girls already what is he?" "He is probably just a Sepp!"

"Am I seeing this right?! Is that jock reading Henry David Thoreau?" "Yeah he is such a Sepp"
via giphy
by Heyhey18ddd April 22, 2016
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Young Aussie Trying really hard to be a Yank
A Western Australian term started in the year 2000 it can be Male or Female usually under the age of 29 years

They only need two of these to became a Sepp

The use of American Colloquialisms
dress like a American rapper, gangster or just simply wears American baseball hat backwards

Has NO respect towards their parents , Authority and
They look at work has a Gaol sentences
They do not care about the Australian history
swearing in public, steeling, bashing and vandalism
Young Aussie Trying really hard to be a Yank (Sepps)
by George Copley June 07, 2010
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