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2.
One who mates with self in a painful manner.
My friend grinnelled himself in the ass till blood came out.
by Malicious April 30, 2003
 
1.
A small liberal arts college in central Iowa. Known for attracting geeks, activists, and all manner of others to brave the bubble.
Grinnell and Carleton have too much in common to not be rivals.
by wellons May 10, 2007