Real Dictionary

gaff
On a boat, a gaff is a pole which is attached to a mast in order to support a particular kind of sail.
countable noun: A gaff is a pole with a point or hook at one end, which is used for catching large fish.

gaff in American English 1
a large, strong hook on a pole, or a barbed spear, used in landing large fish
to strike or land (a fish) with a gaff
noun: an iron hook with a handle for landing large fish
transitive verb: to hook or land (a fish) with a gaff

gaff in American English 2
foolish talk; nonsense
noun: harsh treatment or criticism

gaff in American English 3
intransitive verb: to gamble, esp. to indulge in petty gambling, as to toss coins
transitive verb: to cheat; fleece

gaff in British English 1
to hook or land (a fish) with a gaff
noun: a stiff pole with a stout prong or hook attached for landing large fish

gaff in British English 2
noun: foolish talk; nonsense

gaff in British English 3
noun: a person's home, esp a flat