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1.
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
 
2.
Skunky beer
Bro 1: Did you try that steel reserve in the fridge

Sista 2: dude that shit tastes like taplash, WTF is wrong with you.
by Auricome October 20, 2009
 
3.
Skunky beer
Bro 1: Did you try that steel reserve in the fridge

Sista 2: dude that shit tastes like taplash, WTF is wrong with you.
by Auricome October 20, 2009
 
4.
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