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1.
The concave area that is located beneath the shoulder and arm, also known as the armpit. Closely related to the wenis and the wagina.
A father is explaining the anatomy of the human arm to his son.

Father - "Well son, this here flap o' skin on yer elbow be yer wenis, and the thing on the other side be yer wagina."

Son - "But Pa, what be this here thing under yer arm?"

Father - "Under me shoulder? Oh, that just be me wutthole, son."
by Seru987 June 22, 2009
 
2.
converse of the Wenis, a Wutthole in the soft skin on the inside of your elbow.
Dude i got my blood drawn last week and my Wutthole is still bruised.
by Banditforever November 05, 2009