Taplash occurs when your local bar internally washes it's draft beer system with hot soapy water (which a good bar should do often), but they do not properly flush all of the soap out of the lines. Even a tiny bit of residual soap left in the system causes the draft from the tap to be very flat and have a skunky taste.
Ewww this beer is taplash...
by Clipso December 08, 2011
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What it's called when you slap your dick across someone's face. See also cockslap
That mark on Lisa's face is from when Mark taplashed her.
by MeatBall11 May 08, 2005
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