mosey | A glossary of provincial and local words used in England by Francis Grose

Mosey
·add. ·vi To go, or move (in a certain manner); — usually with out, off, along, ·etc. ...

Webster's Dictionary of the English Language
to mosey
To be off; to leave; to sneak away. A low expression. After I left you, or rather after you left me...

Dictionary of American Words And Phrases by John Russell Bartlett.