Top definition
A large-headed boy who never cleans his hair. It is so greasy that you can see your reflection in it; a very smart boy with little to no penis.
Student 1: Hey man, did you see that Greasy Rusty?

Student 2: Yea bro-you can see yourself in his hair.

OR

Chick 1: Do you have a date to the dance?

Chick 2: No.

Chick 1: Well you could take him.

Chick 2: No, he's too much of a Greasy Rusty.
by yamaha14 March 09, 2009
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