a unique name for a penis, not to be confused with a dingdong (doorbell), may be used in code when not wanting boys to know you are talking about their penis.
You could almost see his dillydong through his pants at the clublast night... or maybe I was just drunk....
Dillyo is a simple combination of two words, deal and yo. Loosely translated it can mean, "whats going on?", "how are things?", or "how are you?". Normally, however, it is directly linked to the phrase, "whats the deal yo?".