insertion of a man's ballsack into another's mouth and bending up and down
Steve: Did you hear what happened to Devin last night?
Bob: No, what happened?
Steve: I steeped the teabag, when Devin had too much to drink last night.
Fear the Turtle is what a woman experiences when she realizes halfway through vaginal intercourse that her bowels are full and her enjoyment of the sex has been superseded by her fear of crapping the bed.
Sue had to askDrew to stop fucking her because she feared the turtle. She got on the can for a minute, then hopped back in bed, and no longer feared the turtle.