mixture of sneaky, devious, vulgar, unscrupulous, underhand in a sexual sense. it was first used near Glasgow UK, in 1988, uncorrectly as the pronunciation of 'snide' which means bogus/counterfeit. It has no reference whatsoever to a golfer of the same name.
1. His advances to her where going nowhere. He was drunk and acting like a Snead and annoying every female within a square mile. or: 2. He had three girls going at the same time, none of them knew it, he was King Snead.