DOUBLE-O
Meaning of DOUBLE-O in English
/dub'euhl oh"/ , n. , pl. double-Os . Older Slang.
careful scrutiny or close inspection.
[ 1915-20; after the two o 's in ONCE-OVER ]
Random House Webster's Unabridged English dictionary.
Полный английский словарь Вебстер - Random House .
2012