A person who displays or shares tendancies, behaviours, and characteristics with a mouse.
If someone is acting this way, the natural thing to do is to point at this person while saying 'maaaaaaaaaaw', so that the person is aware that they have acted in a timid way that shows no backbone in the situation they find themselves in.
He is definately a maw.
This place is full of maws.
I am drowning in maw.
Maaaaaaaaaaaaaw (while pointing at culprit)