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When a cat watches a bird through a window it makes silent repeated movements with its mouth. This is Mibbling.
look out for the accompanying whisker quiver.
The Cat stared out of the window and mibbled at the sparrows it so desperately wanted to catch.

Have you seen my cat mibble at the tits?
Mibble by NekoDolly August 12, 2008
Related Words
A back handed version of the high five. It is more of a slap than a five.
Hey man, good job with that shot! Mibbies!
Mibbies by Joeseph Anderson January 2, 2008
Someone who has never used IRC before except on Mibbit.com
That Mibblet doesn't understand that when you ask a question its mandatory for the Admins to idle for at least 20 minutes before answering.
Mibblet by Arkt1k F0X November 6, 2008
An annoying and unpleasant person who is easily dislikable and is rude to most people around them.
That mibbler won't leave me alone
Mibbler by Black Taylor July 27, 2022

Maple mibble 

A delicious snack consumed by only the most important people, usually paired with barbecue
Jenny: “What are we getting for dinner?”
Dad: “Ribs and maple mibbles, does that sound good?
Jenny: “Yes, I love that meal!”
A cross between "drivel", "mumble" and "waffle". Used to describe the act of going on and on about something very boring or completely irrelevant.
Joe, what are you mibbling on about?
What a load of mibble!
mibble by MazzaT April 18, 2007