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most likly past tense of a verb, outgribe (strictly verbally speaking, the only available example is awkward (as opposed to say 'the mome raths were outgribing'), but the poet selected this marked form for rhythmic purposes)
correcting ex. 2 above:
The kid behind me started outgribing. When he had outgriben to his snout's content...
by wurdnurd March 07, 2005
v. the past tense of outgribe, a word coined by Lewis Carroll.
Last Thanksgiving I sat next to my aunt during dinner, and she outgrabe all over me for the whole meal.
by tangles10 April 27, 2010
1. something between bellowing and whistling with a kind of sneeze in the middle
1. "...and the mome raths outgrabe." (Lewis Carroll, "Through the Looking-glass and What Alice Found There")
2. The kid behind me started outgrabing.
by zeekage October 26, 2003