Top Definition
The state acheived by one who is stupid often and on a regular basis.
Person 1: That guy is such a fucking muppet!
Person 2: Yeah I know, he acheived muppethood last week.
Person 2: Prick!

Old English saying: "George W Bush acheived muppethood the day he was born"
by sixxon June 18, 2007

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