Top Definition
Hybrid of gross and disgusting, its reserved only for when something is super foul.
Mikey's dog Maggie shat on the carpet and his little daughter thought it was candy and ate it, and then threw that up and then the dog ate that.

Mikey said "thats groscusting" before taking his daughter to the ER.
by blahblahhead March 29, 2009
8 Words related to groscusting

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