boot\'boot\ v - 1. To take one's leave, to depart; "It's nigh-on five o'clock... we gotta boot."See also:float, header. 2. Denoting excessive speed or pace, usu. used in the gerundive; "We was doin' at least 90; just bootin' along!" See also:cuff, honkin', humsuck, piss-cut, whiff.