Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • transitive v. Slang To infer or discover; figure out: "I think I'm good at sussing out what's going on” ( Ry Cooder).
  • transitive v. Slang To size up; study: "Suss out the designers in whom you are interested” ( Lucia van der Post).

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Suspicious.
  • n. Suspicious behaviour; the act of loitering with intent.
  • v. To arrest for suspicious behaviour.
  • v. To discover, infer or figure out.
  • v. To study or size up, to check out (examine).
  • n. Social nous.

from The Century Dictionary and Cyclopedia

  • A variant of soss.

Etymologies

Probably short for suspect.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From suspicious. (Wiktionary)
From suspect; originally suss out ("to investigate"). (Wiktionary)

Examples

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  • Also made popular by the Radiohead song, "High and Dry"
    not really used in my neighborhood

    April 22, 2009

  • "But the truth was out for all to see long before the big-name take-downs. For months sourcewatch.org has identified Martin Eisenstadt as a hoax. When Mr. Stein was the victim, he blogged that “there was enough info on the Web that I should have sussed this thing out.�?

    --NY Times story about an internet hoax.

    November 17, 2008