Any portion of a tree which, when looked at when the mind is in the gutter, resembles a vagina.
The oak tree in my front yard had a treegina in it about 3 feet long.
by Faulconbridge October 12, 2006
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Opening or slit on the bark of a tree that appears to look like, or resembles the female anatomy. Usually seen during camping or walking on trails.
Look at the treegina on that tree over there.
by Fthsjustin May 25, 2015
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