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The subtle act of pushing halfway down on the toilet's flush knob, usually used to discolor the small amount of pee that doesn't qualify for a full flush, but still looks a little unsightly.

Usually used by eco-conscious individuals, or at night time when others are sleeping.
After draining the lizard at midnight, I opted for a half-flush in order not to wake the damn kids.

Guy : "You ever have that massive urge to pee, but then only a trickle comes out? That's when I half flush!"

Another Guy: "You should get that looked at man. Could be time for a prostate exam."

Guy : "Screw you dbag. I ain't gettin no hands up this trench."
by shizzinator August 25, 2010
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