snook /snuːk/noun 4verb 3forms 3phrases 1 noun4 •A freshwater and marine fish of the family Centropomidae in the order Perciformes. •Centropomus undecimalis (common snook). •(UK) A disrespectful gesture, performed by placing the tip of a thumb on one's nose with the fingers spread, and typically while wiggling the fingers back and forth. •Any of various other ray-finned fishes in several families. verb3 •To fish for snook. •(no longer used) To sniff out. •(no longer used) To lurk; to lie in ambush. formssnooked · snooking · snooks Phrases with snook cock a snookTo perform a snook, a gesture of disrespect.