The art of taking the head of ones penis in the fist and pulling it up straight in the air leaving the testicles dangling.
The last chook at woolworth's.
The dangling do-dads on a hoodie, the stringy things.
Old mate: "'scuse me, mate. Just thought ya should know that your chook nuts are tucked aye"
Bloke: "...my what? OHHHH! Thanks!"