"As if!" (3)
(Other definitions for not that I've seen before include "Type of logic gate" , "Word of denial" , "A negative word" , "Word of negation" , "logically, operation needed" .)
(Another definition for hah that I've seen is " Expression of surprise (one letter short of a laugh)".)
(Other definitions for pshaw that I've seen before include "Expression of contempt" , "Exclamation of impatience" , "Contemptuous expression" , "scornful reaction" , "Contemptuous cry" .)
(Other definitions for dont make me laugh that I've seen before include "Weak comedies affect me so" , "You must be joking!" , "Bad jokes" , "come off it" .)