One who is afraid of doing what it takes to get the job done. In relation to giving a male oral sex and running to the sink instead of swallowing.
My friend is such a sink-runner, he wouldn't come downtown and pick me up when my car broke down.
by dr.js August 24, 2006
One who, after performing fellatio, runs to the sink to spit.
Dude I thought the chick was cool when she starting slobbin my knob but it turned out she was a dirty rotten sinkrunner.
by poonatic June 01, 2006