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1.
an unexplainable part which has a function which is either unknown or unexplainable, similar to a thingymabob but used in a conversation or discussion of a more technical nature.
I was totally flummoxed until i realised the grosset was out of line with the camber of the grommitpule.

Nah man! It was the grosset which threw the timing out, innit!
by Steviepeas December 11, 2007
 
2.
A derogatory Australian term to describe a person with an over inflated view of their self importance.
Stop being a grosset!

What a total grosset!
by Qwerty00 February 18, 2010