·noun A forced or affected smile; a simper.
II. Smirk ·adj Nice,; smart; spruce; affected; simpering.
III. Smirk ·vi To smile in an affected or conceited manner; to smile with affected complaisance; to Simper.
A finical spruce fellow. To smirk; to smile, or look pleasantly. ...
Dictionary of The Vulgar Tongue by Francis Grose