Green’s Dictionary of Slang

1. to annoy, to provoke.

1943		cited in Cassidy & LePage Dict. Jam. Eng. (1980).
1991		L.E. Adams Jam. Patois 47: Doan come sheg rohn mi wid yu rank fish an’ dem! – Don’t come fool around me with your raw-smelling fishy hands!

2. to seduce.

1958		cited in Cassidy & LePage Dict. Jam. Eng. (1980).
1983		T. White Catch a Fire 239: The bad boys who liked to [...] sheg their stuckies to the motion of the cuckie skank.

3. to do badly.

1970s

T. Rhone Gloss. in Old Story Time (1981) n.p.: sheg: botch.

4. see shag v.¹