Green’s Dictionary of Slang

(W.I., Trin.) a trick, an act of deception; thus pull a skull on, to deceive.

1980		Bomb (Trin.) 22: A Pentecostal Pastor who tried to pull a ‘skull’ on a woman police ended up in court on three charges.
1996		Allsopp Dict. Carib. Eng. Usage 512/2: skull [...] A trick; an act of deception [...] pull a skull vb phr [...] To try a trick (on sb); to do sth dishonest.