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1.
Someone who checks out other men in the locker room while they are changing. "Knob" refers to a mans "rod" or "johnson", and "hawk" refers to the wandering eyes of the suspected knob watcher.
After third hour, little Billy sat and watched the other male students in his area change. Then one of the other boys noticed that Billy's eyes were wandering, so he started shouting "KNOB HAWK, WE GOT A KNOB HAWK, GET THE ROPE, GET THE ROPE!" And then little Billy was strung up and beaten like a toy pinata.
by Beechizzle March 23, 2007
 
2.
a guy with shifty eyes in the locker room or community bathroom. When called out on it, he denies it and turns it around on them.
me: Matt quit being a knob hawk, u sick fuck
matt: u wish i was hawking you, u cum guzzler
by D-Boat March 23, 2007