1. Railroad slang for a green light or permission to proceed. Go = highball
2. verb: to put whichever testicle hangs higher into the vagina during intercourse while leaving the lower one out.
3. verb: to overtake someone in a hallway whether they are stopped or moving.
1. Engineer: the light is green. Conductor: Highball!
2. Man I totally highballed with my girlfriend last night.
3. Dude I was just walking to my office and that gay guy highballed me. It was pretty tight in there too, I think he just wanted some action.
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