A female of utmost ugliness who has little or no respect for her outward appearence.
Often a mosag is referred to as a 'veshloz' or a 'munter'.
Mosags frequently enjoy seual encounters with males who are unaware of the females mosagness
Damn woman you a mean ass mosag.
Aint seen mosag like that since '62.
Mmmmmmmmmmmmmosag( said in a distinctive growly voice familiar with users of the mosag word)