Top Definition
A gay, rotund, jewish man.

Origins of grewster are from the Tri-College Consortium, which is between Swarthmore, Haverford, and Bryn Mawr.

Grewster is an affectionate nickname for such a person.

Grewsters usually hang out in packs with other grewsters, but can often be found with the most elite intelligent population.
Wow, he is such a silly Grewster!

Xander, my friend, you know, the Grewster...

Hey, Grewster, want to go grab a bagel and lox with me for breakfast tomorrow?
by JKoch October 08, 2009

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