Random garble made up by a random person. It is used to express boredom.

The sound made by a marble falling into a glass of milk.

The sound that most closely approximates the way seals and penguins look. Can also be applied to narwhals, walruses &c.

The noise a Manatee AKA Sea Cow makes when it bumps into something, especially if it bumps into said something head first.

An oversized, hideously ugly man or woman who leeches off of anyone around them.

First used in Mr. Natural Comix, circa 1968...the sound made when one ejaculates into another's mouth (in Mr. Natural's case, a Big Baby). Similar to the classic Batman onomotopoea's, such as "paff" "oof" or "spwack"...only, dirtier.
Blorp is indicative of not a thin, mealy stream of ejaculate, no...it suggests something grander, more substantial, like a massive snowball of cum.

The sound a cat makes right at the point of expelling a lodged hairball. Usually, the lodged hairball is accompanied by a massive amount of cat vomit. Not to be confused with the hacking required to bring the hairball to the point of expulsion.