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1.
An adjective used to describe something that is enjoyable, and soft to the touch, to jerk off with.

It is also often used to describe the softness of a fabric, especially t shirts and boxer shorts.

When used to describe the softness of a fabric, it is generally, but not always, implied that jerking off with it would be enjoyable and/or soft to the touch.
Example 1:

Teacher: Are any of you students going to buy the school spirit wear t shit?
All male/hermaphrodite students: It depends if they are jo worthy.

Example 2:

Mother: Why is this soft t shirt covered in so many stains?
Boy: Because it’s jo worthy! I’m not going to use sand paper to beat off! Come on now!
by The Milk Man Jr. November 12, 2010