High and tight
The high and tight can be any of several very short hair styles most commonly worn by men in military service, predominantly in the United States.[1] While many variations of the style exist, the one common denominator is that all of the hair is removed beneath a line that is always situated above the top of the ears. In some cases a sharp line delineates the boundary between the shaved and non-shaved areas, while in others a gradual, tapering effect (or "fade") is achieved. Sometimes a flattop is sported, with a "landing strip" exposing the skin in the center, which is occasionally extended all the way to the back of the head, creating a "horseshoe" effect. The length of the unshaved portion may also vary, but as a rule is no longer than a typical crew cut; sometimes the back and sides of the head are shaved completely with a razor (this is known as "whitewalls").
Beginning in the late 1980s, it crossed over into civilian life, being embraced first by mostly young African-American males (see hi-top fade), then spread to like-aged men in other groups; it has since gained wide acceptance throughout American society.
Other use
"High and tight" is baseball slang for a pitch on the upper inside corner of the strike zone, i.e. a high brushback pitch.