someone that has smoked so much marijuana that they are beyond the point of being stoned that they are resembling a person who has down syndrome
t-bain: we were stonetarded, we played mario for 5 hours

t-pleasure: damn wish i could have been here
by t-pleasure January 20, 2009
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It means that you done smoke so much weed, you cant even funston. On no thanking level at all so that what it means...
Man I got so stonetarded last nite I couldn't even remember my girl friends name... So I called her Sally shh that girl...
by LaLa is so right!! September 26, 2020
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