Top Definition
A very large creature, often defined as a platypus who eats small asian children. A Runco is also know to teach amth, although it is very poor at doing so. Many people find this THING very grotesque, and when it walks the ground trembles. If one encounters such a thing, he/she is to be very wery of such. BE CAREFUL!!!! It will devour you, and Sandra's cellphone
WOW!!! Sandra your such a Runco
by 12345678999hagagaSANDRA June 04, 2009
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