Sure thing

(Other definitions for okay that I've seen before include "Satisfactory; permissible" , "Not terrific but acceptable" , "Permissible (colloq.)" , "Passable" , "Authorise" .)

(Other definitions for fact that I've seen before include "It's certainly not fiction" , "An indisputable truth" , "Piece of information known to be true" , "Fait accompli" , "Piece of indisputable information" .)

(Other definitions for yeah that I've seen before include "Certainly" , "positive response?" , "Definitely (informal)" , "casual agreement" , "OK" .)

(Other definitions for lock that I've seen before include "Hold < wisp of wool" , "Mechanism to keep closed, door say" , "Rugby player" , "tuft of wool" , "Door fastener or tuft of hair" .)

(Other definitions for cert that I've seen before include "Banker" , "Sure thing (that could be dead!)" , "One sure to win (slang)" , "Classification" , "Infallible bet (slang)" .)

(Other definitions for yes that I've seen before include "Validating vote" , "I agree" , "Certainly!" , "Affirmative answer" , "Of course" .)

(Other definitions for yep that I've seen before include "Correct" , "informal approval" , "Affirmative (US colloq.)" , "Positive reaction" .)

(Other definitions for dead cert that I've seen before include "red-hot favourite" , "Sure thing sounding moribund - bet on it" , "One regarded as a favourite" .)