In 2008, Dutch futból player Robbin van Persie scored a goal with his right leg (his nondominant foot), which he called his chocolate leg. I remember it meaning something like: it looks about the same as a normal leg, but it has less content, it's a little hollow inside.
“I know I can shoot with my right leg. Of course my left one’s better but it’s down to your belief in the power of your wrong leg. In Holland we call it your chocolate leg.”