An opponent or enemy that is to be attacked, maimed, and or killed at first glance. Commonly abbreviated as OSO or O.S.O
Xio said our poster looked ugly. That bitch is officially an On sight opp

IS THAT XIO OVER THERE ?! That bitch an OSO! GET HER ASS
by avia_ei_simp April 17, 2023
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While sole beings' lives sinful in fear & frightful unscrupulous morally now sorry insightful yet sightful life characterised by clear flowing transparent streams scream for similar measure of internal reform sun beams.
by Hercolena Oliver June 15, 2010
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a historically near-sighted person is someone who can only remember recent history, wether it be in the recent few centuries or even just the recent few years.
July 4, John: do you realize that a year ago today we had to use bread slices instead of buns for hot dogs?
Bob: do you also that realize today is when america became independent? John: REALLY? Bob: yes, its taught in history class. John: oh, sorry, i didn't know that becuase im historically near-sighted.
by d00dd00d February 5, 2010
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