Best definition
1) A penis resembling a South Pacific starchy tuberous root.
2) A penis you can eat with brown sugar and butter (or marshmallows if you’re sick like that.)
3) A man with such penis.
1) Woah, I haven’t seen a yamcock like that since the seventies!

2) I have the brown sugar, did you bring that yamcock?

3) That yamcock fucked up my Razor scooter!