A firm, donut shaped pillow, worn around the penis. This is used to reduce the extreme pressures of bumping on the pelvic area during crazy intercourse.
This is especially helpful when a girl is lacking in the rear.

In other words, a twankle is a "cushion for pushin"

to tell someone to calm down and relax.

Alternative spelling and pronunciation of the word "Twinkle."

vagina (when used in prose or poetry)