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Short for "mega-retarded", indicating a level of retardation above and beyond all instances previously encountered by the speaker.
"Jesus, you're more m'tarded than I thought!"
by T. Strange July 03, 2003
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Jul 15 Word of the Day
The safeguarding of Earth and other worlds from biological cross-contamination (i.e. billionaires with too much time on their hands).

Also known as “planetary protection.” Planetary protection / quarantine “reflects both the unknown nature of the space environment and the desire of the scientific community to preserve the pristine nature of celestial bodies until they can be studied in detail.”

There are two types of interplanetary contamination. Forward contamination is the transfer of viable organisms from Earth to another celestial body. Back contamination is the transfer of extraterrestrial organisms, if such exist, back to the Earth's biosphere.
Billionaires are having a dick swinging space race while the earth experiences record breaking heatwaves that cause sea creatures to literally cook inside their shells. We need planetary quarantine.
by monkeylabor July 14, 2021
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2
A Mexican who lives in America, but does not understand, or pretends to not understand the English language.

Also see M-Tard
That new employee Jose is such a M-Tard. He knew what I meant when I said "make sure you get my rims clean" -OR- Consuela starts acting M-Tarded around me when I ask her to clean the house better, or if she missed a spot on the floor.
by nostopin September 05, 2010
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3
The guy who wrote the definition for "Fucking Bastard" must be record breakingly m'tarded.
by Stone Dog November 03, 2006
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4
past tense of the surname disease "M'tard."
symptoms include:
yelling, crying, forgiveness, psychosomatic cases, blaming of others for a poor life, staring into space for 2.5 minutes, cringes at the sound of singing, likes cats, and is bi-polar.
remedies to this disease:
alone time, psychiatric help, or suicide.
"Miss M'tarded screamed at us in class again today...fuck that."
by big momma jalopenoes September 14, 2007
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