1.cool, sick
2. peng, fit, hot
Girl 1 - Gurrrrrl that shirt is septic!
Girl 2 - Thanks honey, you're looking pretty septic yourself
by anon48483229jj December 01, 2010
Relating to sewage. Can also be short for "septic tank", or an underground container where sewage and sink waste is drained to.
I had to hire a plumber to fix the leaky septic under our yard because shit was bubbling to the top.
by AYB April 01, 2003
To become intoxicated to the extent that a person can no longer stand up and their words are poorly enunciated. Usually a time like this a person would be making a serious fool of themselves, or be involved in something they will seriously regret tomorrow morning.
Tom: Jesus boy u were quite septic last night!
Henry: I Know, I dont really want to hear about it.
Tom: Remember when you got stuck in the cubical with that ugly fat bird you were shifting all night?
Henry: What? Oh God!
Tom: Ha Ha, you septic fool! Don't you remember!? you had your pants down at your ankles at the time making many attempts to pull them back up but gravity wasn't your friend last night!! Ahhh ha ha ha ha ha!
by Thomas O'Brien August 23, 2007
British cockney rhyming slang for a Yank (a Yankee, an American). As in 'Septic Tank Yank'. I'm told by my British friends the origin of this was the British military, where in WWI American infantrymen exhibited the worst of the worst language, and talked a lot of crap. But being from California, I remind them that I'm about as Yankee as an Australian is a Brit. Calling everyone in America a Yank is really ignorant. The British say Septic, while Australians generally say Seppo (compounded ignorance).
"(The septic..,) Giving the British the synthesizer was like giving whiskey to the Indians - it ruined a nation. - jps"
by jpsully October 25, 2008
verb.: an event that has been dissatisfactory
adj.: bad; gross; dissastifactory; smelly
ex 1. That dance was the most septic thing I've ever been to.
ex 2. Latoya's septic attitude has become so annoying.
by jo jo jo bitch bojangles August 13, 2006

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