Definition of hit and runs:
(n) :
(law) The crime of causing a traffic collision, and leaving without acknowledging responsibility.
(v) :
(informal) To hit something or someone with a vehicle and leave the scene of the incident.
(n) :
(baseball) A play where the baserunners leave their base before the batter hits the ball, assuming that the batter will in fact hit the ball and this will give them an advantage.
(n) :
(military) The tactic of attacking one place and then quickly moving to another before defenders can react.
(n) :
(slang, idiomatic) Sexual intercourse followed by a prompt departure; a one-night stand.
(v) :
(slang, idiomatic, intransitive) To engage in sexual intercourse followed by a prompt departure; to engage in a one-night stand.