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1.
A hardcore fan of the musician Emilie Autumn. Not to be confused with a Muffin, who is a less active fan of her music.
They can often be found wearing corsets, drinking tea, crafting, or "spreading the Plague" aka advertising Miss Autumn's music to the world.
The also refer to themselves as inmates in "The Asylum"
Emilie Autumn: What time is it, Muffins?
Just normal muffins/fans: ...?
Plague Rats: TEA TIME!
Por AsylumInmate 06 de diciembre de 2009
 
2.
A person who brings badness or misfortune to people. Some do it on purpose, but this can also be an opinion someone has of themselves due to lack of good self-esteem.
Every guy she broke up with had his mother kidnapped. She must have been a plague-rat.
Por Wouldn't You Like To Know Bob 12 de mayo de 2011
 
3.
a code word for pad.
used by super fly girls
girl 1: damn i gotta go change my plague rat"
girl 2: you want one?

guy 1: say what????
Por vixstix87364748 03 de noviembre de 2008