Know how to use "fewer" and "less"? Find out.
And so on; so they say repeatedly: Snyder is too old, too abrasive, yadda yadda, on and on (1990s+)
A greeting or said to get someone's attention; hey: Yo, dudes and babes!
[1859+; even though yo and yoho are very old utterances, found by 1420, the recent revival of yo as a primarily black interjection has spawned comment; Ernest Paolino of Philadelphia, indignant because a New York writer had claimed the syllable for New York, recalls it from the 1930s as shortening of walyo; in the WWII Army it was the common form of here! used in responding to roll-calls]