After a man cums and the penis softens it shrinks like a frightened turtle into it's shell, thus causing the excess cum trapped in the penis to drip out.
A motion performed by stacking one's hands on top of one another, extending the thumbs and rotating the thumbs slowly. Performed after a friend has said/done something awkward, either to ease the tension or further humiliate the friend.
"Dog, today carver asked laura to the dance, and she turned him down in front of like 50 people."
"What'd you do?"
"We had to bust out the awkward turtle"