What Does Double O Mean in Slang?

nounWord forms: plural -Os. old-fashioned slang. careful scrutiny or close inspection. [1915–20; after the two o's in once-over]

What does a double O mean?

A 00 (typically read "Double O" and denoted in Fleming's novels by the letters "OO" rather than the digits "00") is a field agent that holds a licence to kill in the field, at their discretion, to complete any mission.

What does 100 mean?

Keep it 100 is a slang phrase that means being authentic and truthful, akin to “keeping it real.”