verb (used with object)
Chiefly British Slang. to investigate or figure out (usually followed by out ).

1965–70; earlier, to suspect, a suspect, shortening of suspect Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
suss (sʌs)
1.  (often foll by out) to attempt to work out (a situation, person's character, etc), esp using one's intuition
2.  Also: sus to become aware of; suspect (esp in the phrase suss it)
3.  sharpness of mind; social astuteness
[C20: shortened from suspect]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

"to figure out, investigate and discover," 1966, earlier "to suspect" (1953, police jargon), a slang shortening of suspect (v.).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
It was difficult to suss out the reasons for all the delays.
But there are general principles, and also things you can do to suss things out
  in advance.
To suss this out, you'll need the help of an experienced travel clinician.
In the end the group decided to try and suss out whether the bees homed in on
  nectar-laden flowers using color or spatial cues.
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