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The sound a cat makes when it meows underwater. First seen in the YouTube video "cat meows underwater".

The action of making the noise a cat makes when it's underwater.
When I put my cat in the bathtub, she stuck her face halfway in the water and meowed, producing a mweb.

After Brooke and I watched "cat meows underwater" we couldn't stop mwebing for hours.
by Iliketurtles426 March 08, 2013
The AOL of South Africa.
Mweb has the worst internet accounts you can get in South Africa.
by lordbal January 03, 2008