A shortened version of for certain. Almost wiggerish in it's tone.

It's spelling comes from the speech of Gonzalo in Act 3 Scene 3 of Shakespeare's "The Tempest" - "For, certes, these are people of the island—"
"Yo mate you want to hit up H-Town to cruise for bitches?"
"For certes mate"
by Slim Jim 3:16 January 8, 2008
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Certificates or other documentation that can significantly qualify one for a better/decent job. Often of a technical computer/networking nature.
Fuck, getting my A+ cert was easy as hell to get after that course.

Congrats, I just spent 3k on a course to get my networking certs.
by letfireraindown November 16, 2010
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Short for Concerta, a medication which is commonly prescribed to people with learning disabilities. Often abused by college students.
I just wrote 8 pages off the certs
by laurentyethagenius September 25, 2016
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A: a delicious mint

B: a delicious mint used as a throwing knife
i pwnd jarret in the juggular with a certs and made him cough and sputter up some blood
by [sLuT] Ezekiel June 29, 2006
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A useless test taken by all Irish teenagers halfway through secondary school. It involves learning a tonne of shit that you'll forget when you're 18 like everything else at school, only in this case the result has no effect whatsoever on your later life.
Kid: Why do we have to study so hard?
Teacher:It's all going to show up in the Junior Cert.
Unfortunately the conversation ends here as nobody has enough balls to say,'why the hell do we do the Junior Cert?'
by DaMan1997 September 21, 2011
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The last exam you'd take in an Irish secondary school that if u try to study for you'll turn from looking 17 to 42 years old, completely f*cks up your sleeping cycle and you'd be lucky to survive.
Jaysus did ye see Aoife after she did her leaving cert, she looked a f*ckin state, she did !
by Alwaysonfleek;) January 18, 2016
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