1. A clown's penis.
2. A term for a funny looking, or irregularly shaped penis.
3. A person behaving in a ridiculous or dick-headed manner.
4. A tasty cake treat marketed by clowns.
"Did you notice Bobo's clowndong was looking a little obvious at little Bobby's birthday party?"
"Did you see Bob drunk and naked at the office luncheon? Man, he's got quite the clowndong!"
"Damn it Bill! Give me back my money - don't be such a clowndong!"
"Mmm - chocolate clowndongs!"
A person you hate intensely not because they deserve such hatred but because they serve as a focus for your general hatred. A healthy way to dispense with excess animosity.
Jake's not really that big an asshole. He just serves as my hate sink.