Definition of fluking:
(n) :
A lucky or improbable occurrence that could probably never be repeated.
(v) :
To obtain a successful outcome by pure chance.
(v) :
(snooker) To fortuitously pot a ball in an unintended way.
(n) :
A summer flounder (Paralichthys dentatus)
(n) :
(nautical) Any of the triangular blades at the end of an anchor, designed to catch the ground.
(n) :
Either of the two lobes of a whale's or similar creature's tail.