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1.
Phenomonon in which after masturbating, the inside of the penis burns/irritates inexplicably for an indeffinite amount of time. Not an STD.
I can't keep jacking off before bed, acid dick is keeping me up.
by Brian` August 09, 2007
 
2.
The residual effect of putting your regular dick into an Acid Pussy. See Acid Pussy.
"My brother is a whore, and fucks whores with acid pussy, and now his dick is on fire...because it is now acid dick."
by What's My Name Fool?! August 18, 2011