mwoo 

mwoo is Whalean for "agreed" created on the Runescape off topic forums. although it means "agreed" it can mean an expression of joy by adding more o's to the end of it

"the sun is shining"
"mwoo"

mwoo by jimbobloopelstrok June 30, 2008

Mwoop 

A term used to describe the emotional state under which a bunny's ears might slowly droop (in sadness or glumness). Also functions as an onomatopoeic descriptor for the bunny ear noise. Mwoop is often used to express sympathy.

"I feel mwoop today."

V: I missed dinner...
Y: Mwoop!!

Mwoop by Mwoop November 7, 2007

Mwoop 

A random exclamation used when on MSN, and you can't think of a decent reply.

Person A: So anyway <insert long rant here>
Person B:Mwoop

Mwoop by Lizzie June 23, 2004

Mwoof

A fwoof, but male

"Wow. what a mwoof!"

Mwoof by No098 December 31, 2018