gaff (n.1)

"iron hook," c. 1300, gaffe, from Old French gaffe "boat hook" (see gaffe). Specifically of the hook on a fishing spear from 1650s. As a type of spar from 1769. Related: gaff-hook.

gaff (n.2)

"talk," 1812, in phrase blow the gaff "spill a secret," of uncertain origin. OED points out Old English gafspræc "blasphemous or ribald speech," and Scottish gaff "loud, rude talk" (by 1825). Compare gaffe.

gaff (n.3)

"cheap music hall or theater; place of amusement for the lowest classes," 1812, British slang, earlier "a fair" (1753), of unknown origin.

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Definitions of gaff from WordNet

gaff (n.)
a sharp metal spike or spur that is fastened to the leg of a gamecock;
gaff (n.)
a spar rising aft from a mast to support the head of a quadrilateral fore-and-aft sail;
gaff (n.)
an iron hook with a handle; used for landing large fish;