The opposite of water off a duck's back. An insult that you allow to cling to you and burn you like hell.
Don't dwell on insults. Research has found that acid off a duck's back yields very unfavorable results for the duck in question.
by spinaltapsoundguy January 6, 2010
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acid off a duck's back • acid • acid bath • acid reflux • acid rock • acid face • acid rap • acid test • acid casualty • Acid-Crunk