Based on the term "subussy", a "spongussy" is using Spongebob as a substitute for a pussy. Typically used by JimmyHere fans, this is a common phrase to throw into any conversation.
The word “Sunussy” is a slang term meaning smart. People today like to use it to describe themselves or give themself a confidence boost. If you hear someone say sunussy, you definitely want to be their friend.
The genitals (usually referring to a tentacle) of the daycare attendant, typically known as sun, or sundrop, from the game Five Nights At Freddy's: Security Breach